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Massachusetts Gov. Deval Patrick reads from President John F. Kennedys inaugural address during a ceremony to commemorate the 50th anniversary of Kennedys assassination at the John F. Kennedy Library and Museum in Boston. Kennedy, the 35th President of the United States was assassinated in Dallas 50 years ago today. (AP PhotoStephan Savoia)
Massachusetts Gov. Deval Patrick reads from President John F. Kennedy's inaugural address during a ceremony to commemorate the 50th anniversary of Kennedy's assassination at the John F. Kennedy Library and Museum in Boston. Kennedy, the 35th President of the United States was assassinated in Dallas 50 years ago today. (AP Photo/Stephan Savoia)
Irelands Minister for Foreign Affairs and Trade, Eamon Gilmore, centre left, stands during a ceremony to lay a wreath on behalf of the Irish Government, outside the Embassy of the United States of America in Dublin, Ireland, Friday, Nov. 22, 2013. The Irish Defence Forces, as well as the original cadets who served as honour guards at President Kennedys funeral in 1963, attended the ceremony in Dublin to mark the fiftieth anniversary of the death of US President John F. Kennedy. (AP PhotoPeter Morrison)
Ireland's Minister for Foreign Affairs and Trade, Eamon Gilmore, centre left, stands during a ceremony to lay a wreath on behalf of the Irish Government, outside the Embassy of the United States of America in Dublin, Ireland, Friday, Nov. 22, 2013. The Irish Defence Forces, as well as the original cadets who served as honour guards at President Kennedy's funeral in 1963, attended the ceremony in Dublin to mark the fiftieth anniversary of the death of US President John F. Kennedy. (AP Photo/Peter Morrison)
Hilary Hopkins of Cambridge, Mass., signs a memory book at the John F. Kennedy Presidential library and Museum upon her arrival Friday morning Nov. 22, 2013 in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. Hopkins says she was 25 years-old an in Harvard Square when Kennedy died. (AP PhotoStephan Savoia)
Hilary Hopkins of Cambridge, Mass., signs a memory book at the John F. Kennedy Presidential library and Museum upon her arrival Friday morning Nov. 22, 2013 in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. Hopkins says she was 25 years-old an in Harvard Square when Kennedy died. (AP Photo/Stephan Savoia)
Members of the Coalition of Political Assassinations demonstrate during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedys motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP PhotoBenny Snyder)
Members of the Coalition of Political Assassinations demonstrate during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Benny Snyder)
The Irish Defence Forces, left, join members of the original 3th class cadets who served as honour guards at President Kennedys funeral in 1963, with from left, Joe Ahern, Dick Heaslip, Hugh ODonnell, Ken Byrne, Don Brennock and Billy Nott during a ceremony outside the Embassy of the United States of America in Dublin, Ireland, Friday, Nov. 22, 2013. The event marked the fiftieth anniversary of the death of President John F. Kennedy. (AP PhotoPeter Morrison)
The Irish Defence Forces, left, join members of the original 3th class cadets who served as honour guards at President Kennedy's funeral in 1963, with from left, Joe Ahern, Dick Heaslip, Hugh O'Donnell, Ken Byrne, Don Brennock and Billy Nott during a ceremony outside the Embassy of the United States of America in Dublin, Ireland, Friday, Nov. 22, 2013. The event marked the fiftieth anniversary of the death of President John F. Kennedy. (AP Photo/Peter Morrison)
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Dallas Mayor Mike Rawlings speaks during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedys motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP PhotoLM Otero)
Dallas Mayor Mike Rawlings speaks during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/LM Otero)
The Dallas Metro Police Pipes and Drums perform during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedys motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP PhotoTony Gutierrez)
The Dallas Metro Police Pipes and Drums perform during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez)
John F. Kennedy High School students from left Joseph Robles, Liliana Navarro, and Mohamed Alamy showcase their school remembrance exhibit of U.S. President John F. Kennedy in Granada Hills, Calif., on Friday, Nov. 22, 2013. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. In 2007 JFK High graduate Alex Gonzalez of Arleta, not seen, painted a large acrylic mural of Kennedys face in the schools foyer in honor of its 40th anniversary. (AP PhotoDamian Dovarganes)
John F. Kennedy High School students from left: Joseph Robles, Liliana Navarro, and Mohamed Alamy showcase their school remembrance exhibit of U.S. President John F. Kennedy in Granada Hills, Calif., on Friday, Nov. 22, 2013. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. In 2007 JFK High graduate Alex Gonzalez of Arleta, not seen, painted a large acrylic mural of Kennedy's face in the school's foyer in honor of its 40th anniversary. (AP Photo/Damian Dovarganes)
Wallace Johnson, 74, of Dumfries, Va., left, a green beret, with the Capitol Chapter of the Special Forces Association, and two fellow green berets lay a beret at the gravesite of President John F. Kennedy, Friday, Nov. 22, 2013, at Arlington National Cemetery in Arlington, Va., on the 50th anniversary of Kennedys death. (AP PhotoJacquelyn Martin)
Wallace Johnson, 74, of Dumfries, Va., left, a green beret, with the Capitol Chapter of the Special Forces Association, and two fellow green berets lay a beret at the gravesite of President John F. Kennedy, Friday, Nov. 22, 2013, at Arlington National Cemetery in Arlington, Va., on the 50th anniversary of Kennedy's death. (AP Photo/Jacquelyn Martin)
People gather before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedys motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963.(AP PhotoTony Gutierrez)
People gather before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963.(AP Photo/Tony Gutierrez)
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A tour group walks past a memorial wreath displayed next to the bronze memorial bust, by Robert Berks, of President John F. Kennedy in the grand foyer of the John F. Kennedy Center for the Performing Arts in Washington, Friday, Nov. 22, 2013, on the 50th anniversary of President John F. Kennedys death. (AP PhotoCarolyn Kaster)
A tour group walks past a memorial wreath displayed next to the bronze memorial bust, by Robert Berks, of President John F. Kennedy in the grand foyer of the John F. Kennedy Center for the Performing Arts in Washington, Friday, Nov. 22, 2013, on the 50th anniversary of President John F. Kennedy's death. (AP Photo/Carolyn Kaster)
Dallas Mayor Mike Rawlings pauses for a moment at 1230 p.m., the time when President John F. Kennedy was shot, during a ceremony to mark the 50th anniversary of the assassination, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedys motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP PhotoLM Otero)
Dallas Mayor Mike Rawlings pauses for a moment at 12:30 p.m., the time when President John F. Kennedy was shot, during a ceremony to mark the 50th anniversary of the assassination, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/LM Otero)
Barbara Clark wipes away a tear as she listens to a Andrew Fallaci read a Kennedy story at the Kennedy Memorial during a remembrance of the assassination of John F. Kennedy, 50 years ago in Dallas, on Friday, Nov. 22, 2013 in Hyannis, Mass. Across the country flags flew at half-staff, and moments of silence were planned for the hour when Kennedy was shot riding in a motorcade. (AP PhotoThe Cape Cod Times, Steve Heaslip)
Barbara Clark wipes away a tear as she listens to a Andrew Fallaci read a Kennedy story at the Kennedy Memorial during a remembrance of the assassination of John F. Kennedy, 50 years ago in Dallas, on Friday, Nov. 22, 2013 in Hyannis, Mass. Across the country flags flew at half-staff, and moments of silence were planned for the hour when Kennedy was shot riding in a motorcade. (AP Photo/The Cape Cod Times, Steve Heaslip)
Gov. Deval Patrick, right, and L. Scott Rice, Adjutant General of the Massachusetts National Guard, lay a wreath at the State House statue of President John F. Kennedy, Friday, Nov. 22, 2013, in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP PhotoBoston Herald, Mark Garfinkel)
Gov. Deval Patrick, right, and L. Scott Rice, Adjutant General of the Massachusetts National Guard, lay a wreath at the State House statue of President John F. Kennedy, Friday, Nov. 22, 2013, in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP Photo/Boston Herald, Mark Garfinkel)
The three Scouts ready to lay the wreath. (Bruce Andersen)
The three Scouts ready to lay the wreath. (Bruce Andersen)
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The Scouts wreath-laying at Arlington National Cemetery. (Bruce Andersen)
The Scouts' wreath-laying at Arlington National Cemetery. (Bruce Andersen)
Wreaths at the Eternal Flame. (Bruce Andersen)
Wreaths at the Eternal Flame. (Bruce Andersen)
The scouts head to President Kennedys tomb. (WTOPKristi King)
The scouts head to President Kennedy's tomb. (WTOP/Kristi King)
The Boy Scouts wreath includes President Kennedys famous quote Ask not what your country can do for you ask what you can do for your country. Scout leader Greg Motta says its based on the Scout oath. (WTOPKristi King)
The Boy Scouts' wreath includes President Kennedy's famous quote "Ask not what your country can do for you; ask what you can do for your country." Scout leader Greg Motta says it's based on the Scout oath. (WTOP/Kristi King)
Scouts Ben Andersen, Ben Motta and Alex Pawlica ready to lay a wreath at the Eternal Flame, in Arlington National Cemetery, on Friday. (WTOPKristi King)
Scouts Ben Andersen, Ben Motta and Alex Pawlica ready to lay a wreath at the Eternal Flame, in Arlington National Cemetery, on Friday. (WTOP/Kristi King)
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A crowd wearing rain ponchos and bundled for the cold, gathers before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedys motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP PhotoTony Gutierrez)
A crowd wearing rain ponchos and bundled for the cold, gathers before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez)
A woman visiting the John F. Kennedy Presidential Library and Museum views a display of the flag that draped Kennedys casket and a photo of Jacqueline Kennedy during the funeral Friday Nov. 22, 2013 in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP PhotoStephan Savoia)
A woman visiting the John F. Kennedy Presidential Library and Museum views a display of the flag that draped Kennedy's casket and a photo of Jacqueline Kennedy during the funeral Friday Nov. 22, 2013 in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP Photo/Stephan Savoia)
Joseph Poggi, a security guard at the John F. Kennedy Presidential Library and Museum, sits at the information desk before the doors open to the public Friday Nov. 22, 2013 in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP PhotoStephan Savoia)
Joseph Poggi, a security guard at the John F. Kennedy Presidential Library and Museum, sits at the information desk before the doors open to the public Friday Nov. 22, 2013 in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP Photo/Stephan Savoia)
An unidentified girl, left, holds a rose during a wreath ceremony with former US Ambassador to Ireland Jean Kennedy Smith, center, and Patrick Hallinan, executive director of Army National Military Cemeteries, at the gravesite of President John F. Kennedy, Friday, Nov. 22, 2013, at Arlington National Cemetery in Arlington, Va., on the 50th anniversary of Kennedys death. (AP PhotoJacquelyn Martin)
An unidentified girl, left, holds a rose during a wreath ceremony with former US Ambassador to Ireland Jean Kennedy Smith, center, and Patrick Hallinan, executive director of Army National Military Cemeteries, at the gravesite of President John F. Kennedy, Friday, Nov. 22, 2013, at Arlington National Cemetery in Arlington, Va., on the 50th anniversary of Kennedy's death. (AP Photo/Jacquelyn Martin)
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedys motorcade travels through Dallas. (AP PhotoPRNewsFotoNewseum, File) THIS CONTENT IS PROVIDED BY PRNewsfoto and is for EDITORIAL USE ONLY
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedy's motorcade travels through Dallas. (AP Photo/PRNewsFoto/Newseum, File) THIS CONTENT IS PROVIDED BY PRNewsfoto and is for EDITORIAL USE ONLY
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The Irish Defence Forces, left, join members of the original 3th class cadets who served as honour guards at President Kennedys funeral in 1963, with from left, Joe Ahern, Dick Heaslip, Hugh ODonnell, Ken Byrne, Don Brennock and Billy Nott during a ceremony outside the Embassy of the United States of America in Dublin, Ireland, Friday, Nov. 22, 2013. The event marked the fiftieth anniversary of the death of President John F. Kennedy. (AP PhotoPeter Morrison)
The Irish Defence Forces, left, join members of the original 3th class cadets who served as honour guards at President Kennedy's funeral in 1963, with from left, Joe Ahern, Dick Heaslip, Hugh O'Donnell, Ken Byrne, Don Brennock and Billy Nott during a ceremony outside the Embassy of the United States of America in Dublin, Ireland, Friday, Nov. 22, 2013. The event marked the fiftieth anniversary of the death of President John F. Kennedy. (AP Photo/Peter Morrison)
Tatiana Schlossberg granddaughter of President J.F. Kennedy, right, with Matthew Barzun U.S. Ambassador to the United Kingdom, left, and Tony Badger Kennedy Memorial Trust prepare to lay wreaths at the JFK memorial, Runnymede, England, Friday, Nov. 22, 2013. Friday is the 50th anniversary of the assassination of President John F. Kennedy in Dallas. (AP PhotoAlastair Grant)
Tatiana Schlossberg granddaughter of President J.F. Kennedy, right, with Matthew Barzun U.S. Ambassador to the United Kingdom, left, and Tony Badger Kennedy Memorial Trust prepare to lay wreaths at the JFK memorial, Runnymede, England, Friday, Nov. 22, 2013. Friday is the 50th anniversary of the assassination of President John F. Kennedy in Dallas. (AP Photo/Alastair Grant)
A flag flies at half-staff above the White House in Washington early Friday morning, Nov. 22, 2013. President Barack Obama ordered that flags be lowered at government buildings to mark the 50th anniversary of President John F. Kennedys assassination. Obama says the anniversary is a day to honor Kennedys memory and celebrate his enduring imprint on American history. Obama says Kennedys vision for the U.S. and the world lives in the generations he inspired.(AP PhotoPablo Martinez Monsivais)
A flag flies at half-staff above the White House in Washington early Friday morning, Nov. 22, 2013. President Barack Obama ordered that flags be lowered at government buildings to mark the 50th anniversary of President John F. Kennedy's assassination. Obama says the anniversary is a day to honor Kennedy's memory and 'celebrate his enduring imprint on American history.' Obama says Kennedy's vision for the U.S. and the world lives 'in the generations he inspired."(AP Photo/Pablo Martinez Monsivais)
Members of the Kennedy family, including former US Ambassador to Ireland Jean Kennedy Smith, fourth from left, hold hands as they pay their respects at the gravesite of President John F. Kennedy, Friday, Nov. 22, 2013, at Arlington National Cemetery in Arlington, Va., on the 50th anniversary of Kennedys death. (AP PhotoJacquelyn Martin)
Members of the Kennedy family, including former US Ambassador to Ireland Jean Kennedy Smith, fourth from left, hold hands as they pay their respects at the gravesite of President John F. Kennedy, Friday, Nov. 22, 2013, at Arlington National Cemetery in Arlington, Va., on the 50th anniversary of Kennedy's death. (AP Photo/Jacquelyn Martin)
The sun rises over Arlington National Cemetery on the 50th anniversary of the death of President John F. Kennedy, Friday, Nov. 22, 2013. (AP PhotoJacquelyn Martin)
The sun rises over Arlington National Cemetery on the 50th anniversary of the death of President John F. Kennedy, Friday, Nov. 22, 2013. (AP Photo/Jacquelyn Martin)
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Attorney General Eric Holder pays his respects at the grave of John F. Kennedy at Arlington National Cemetery on Friday, Nov. 22, 2013, on the 50th anniversary of Kennedys death. Holder has been visiting the grave since his youth, and used to come with his mother before she passed away. (AP PhotoJacquelyn Martin)
Attorney General Eric Holder pays his respects at the grave of John F. Kennedy at Arlington National Cemetery on Friday, Nov. 22, 2013, on the 50th anniversary of Kennedy's death. Holder has been visiting the grave since his youth, and used to come with his mother before she passed away. (AP Photo/Jacquelyn Martin)
The eternal flame shines in the early morning light at the grave of John F. Kennedy at Arlington National Cemetery on Friday, Nov. 22, 2013, on the 50th anniversary of Kennedys death. (AP PhotoJacquelyn Martin)
The eternal flame shines in the early morning light at the grave of John F. Kennedy at Arlington National Cemetery on Friday, Nov. 22, 2013, on the 50th anniversary of Kennedy's death. (AP Photo/Jacquelyn Martin)
In this image made available by Tony Zappone, President John F. Kennedy stands in a convertible as he is driven through Tampa, Fla. on Nov. 18, 1963. The president was in Tampa to give a speech commemorating the 50th anniversary of the first scheduled passenger airplane flight and to speak to the Florida Chamber of Commerce. A film and photo exhibit at the Tampa Bay History Center, documents those few hours he spent in Tampa. U.S. Rep. Sam Gibbons is seated to the right. (AP PhotoTony Zappone)
In this image made available by Tony Zappone, President John F. Kennedy stands in a convertible as he is driven through Tampa, Fla. on Nov. 18, 1963. The president was in Tampa to give a speech commemorating the 50th anniversary of the first scheduled passenger airplane flight and to speak to the Florida Chamber of Commerce. A film and photo exhibit at the Tampa Bay History Center, documents those few hours he spent in Tampa. U.S. Rep. Sam Gibbons is seated to the right. (AP Photo/Tony Zappone)
FILE - In this May 25, 1964 file photo, Mrs. Jacqueline Kennedy, wife of the late president, John F. Kennedy, talks to newsmen during a preview tour of the exhibit of the late President Kennedys mementoes, in New York. At her side is U.S. Attorney General Robert Kennedy, brother of John F. Kennedy. Janis Hirschs note, among some 800,000 sent to Mrs. Kennedy in the two months after President John F. Kennedys Nov. 22, 1963, killing in Dallas, is featured along with about 20 others in Letters to Jackie Remembering President Kennedy, airing 9 p.m. EST Sunday, Nov. 17, 2013, on TLC. (AP Photo, File)
FILE - In this May 25, 1964 file photo, Mrs. Jacqueline Kennedy, wife of the late president, John F. Kennedy, talks to newsmen during a preview tour of the exhibit of the late President Kennedy's mementoes, in New York. At her side is U.S. Attorney General Robert Kennedy, brother of John F. Kennedy. Janis Hirsch's note, among some 800,000 sent to Mrs. Kennedy in the two months after President John F. Kennedy's Nov. 22, 1963, killing in Dallas, is featured along with about 20 others in "Letters to Jackie: Remembering President Kennedy," airing 9 p.m. EST Sunday, Nov. 17, 2013, on TLC. (AP Photo, File)
This Saturday, Nov. 23, 1963 file photo shows the front page of the West Berlin newspaper, Bildzeitung. The headline reads Assassination of U.S. President Kennedy Shot. Friday, Nov. 22, 2013 marks the 50th anniversary of his death. (AP PhotoFile)
\This Saturday, Nov. 23, 1963 file photo shows the front page of the West Berlin newspaper, "Bildzeitung." The headline reads "Assassination of U.S. President: Kennedy Shot." Friday, Nov. 22, 2013 marks the 50th anniversary of his death. (AP Photo/File)
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This Friday, Nov. 22, 1963 file photo shows the front pages of seven British national daily newspapers in London headlining the assassination of U.S. President John F. Kennedy. Friday, Nov. 22, 2013 marks the 50th anniversary of his death. (AP PhotoFile)
This Friday, Nov. 22, 1963 file photo shows the front pages of seven British national daily newspapers in London headlining the assassination of U.S. President John F. Kennedy. Friday, Nov. 22, 2013 marks the 50th anniversary of his death. (AP Photo/File)
FILE - In this May 14, 1965 file photo, John Kennedy Jr., son of U.S. President John F. Kennedy, talks with a British police officer after the dedication ceremony for the memorial to the late president at Runnymede, Surrey, England. At second right is Jacqueline Kennedy. On an English hillside near where the Magna Carta was signed eight centuries ago, a seven ton Portland stone memorial stands on the historic grounds on an acre of land which became American property, in perpetuity - a gift from the British people. (AP PhotoFile)
FILE - In this May 14, 1965 file photo, John Kennedy Jr., son of U.S. President John F. Kennedy, talks with a British police officer after the dedication ceremony for the memorial to the late president at Runnymede, Surrey, England. At second right is Jacqueline Kennedy. On an English hillside near where the Magna Carta was signed eight centuries ago, a seven ton Portland stone memorial stands on the historic grounds on an acre of land which became American property, in perpetuity - a gift from the British people. (AP Photo/File)
FILE - In this Friday morning, Nov. 22, 1963 file photo, President John F. Kennedy, center, and Vice President Lyndon Johnson, center right, walk with others in downtown Fort Worth, Texas. Later in the morning, they headed to Dallas for a motorcade to a planned luncheon speech. It was part of a trip to help mend a rift among Texas Democrats and try to secure the state for Kennedy in the 1964 election. (AP PhotoHouston Chronicle)
FILE - In this Friday morning, Nov. 22, 1963 file photo, President John F. Kennedy, center, and Vice President Lyndon Johnson, center right, walk with others in downtown Fort Worth, Texas. Later in the morning, they headed to Dallas for a motorcade to a planned luncheon speech. It was part of a trip to help mend a rift among Texas Democrats and try to secure the state for Kennedy in the 1964 election. (AP Photo/Houston Chronicle)
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedy, center on foreground platform, addresses a rain-soaked crowd in Fort Worth, Texas. In an interview, Secret Service agent Clint Hill recalled, I heard the noise outside of a large, friendly crowd gathering, despite the drizzle, for a speech Kennedys first event of a packed day. (AP PhotoFerd Kaufman)
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedy, center on foreground platform, addresses a rain-soaked crowd in Fort Worth, Texas. In an interview, Secret Service agent Clint Hill recalled, "I heard the noise outside" of a large, friendly crowd gathering, despite the drizzle, for a speech _ Kennedy's first event of a packed day. (AP Photo/Ferd Kaufman)
FILE - In this Friday, Sept. 13, 2013 file photo, Ruth Hyde Paine, who offered up her home and lent other aid to the Lee Harvey Oswald family prior to the assassination of President John F. Kennedy in 1963, speaks to the Sonoma Valley Historical Society in Sonoma, Calif. In her first public remarks in recent years, Paine reflected on the events a half century ago and told how she helped Oswald land a job at the Texas School Book Depository from where the fatal bullets were fired. In the foreground is a photograph of her with the Oswald family taken the day after the assassination. (AP PhotoEric Risberg)
FILE - In this Friday, Sept. 13, 2013 file photo, Ruth Hyde Paine, who offered up her home and lent other aid to the Lee Harvey Oswald family prior to the assassination of President John F. Kennedy in 1963, speaks to the Sonoma Valley Historical Society in Sonoma, Calif. In her first public remarks in recent years, Paine reflected on the events a half century ago and told how she helped Oswald land a job at the Texas School Book Depository from where the fatal bullets were fired. In the foreground is a photograph of her with the Oswald family taken the day after the assassination. (AP Photo/Eric Risberg)
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FILE - In this Feb. 14, 1969 file photo, Buell Wesley Frazier of Irving, Texas, a co-worker of Lee Harvey Oswald at the Texas School Book Depository in Dallas, leaves court after testifying in the Clay Shaw trial in New Orleans. Frazier testified that he gave Oswald a ride to work on the day of the assassination of U.S. President John F. Kennedy. Much was unusual about that morning. Normally, Oswald would wait to be picked up normally, he would have carried a sack lunch. Unlike most Fridays, he told Frazier he would not need a ride home that night. And then there was the long, paper-wrapped package in the backseat. When Frazier asked, Oswald said it contained curtain rods. (AP Photo)
FILE - In this Feb. 14, 1969 file photo, Buell Wesley Frazier of Irving, Texas, a co-worker of Lee Harvey Oswald at the Texas School Book Depository in Dallas, leaves court after testifying in the Clay Shaw trial in New Orleans. Frazier testified that he gave Oswald a ride to work on the day of the assassination of U.S. President John F. Kennedy. Much was unusual about that morning. Normally, Oswald would wait to be picked up; normally, he would have carried a sack lunch. Unlike most Fridays, he told Frazier he would not need a ride home that night. And then there was the long, paper-wrapped package in the backseat. When Frazier asked, Oswald said it contained curtain rods. (AP Photo)
Buell Wesley Frazier looks out onto Dealey Plaza from a window on the seventh floor of the Texas School Book Depository building in Dallas on Thursday, Nov. 14, 2013. Frazier was a co-worker of Lee Harvey Oswald at the depository and gave him a ride to work on the day of the assassination of John F. Kennedy. Much was unusual about that morning. Normally, Oswald would wait to be picked up normally, he would have carried a sack lunch. Unlike most Fridays, he told Frazier he would not need a ride home that night. And then there was the long, paper-wrapped package in the backseat. When Frazier asked, Oswald said it contained curtain rods. (AP PhotoLM Otero)
Buell Wesley Frazier looks out onto Dealey Plaza from a window on the seventh floor of the Texas School Book Depository building in Dallas on Thursday, Nov. 14, 2013. Frazier was a co-worker of Lee Harvey Oswald at the depository and gave him a ride to work on the day of the assassination of John F. Kennedy. Much was unusual about that morning. Normally, Oswald would wait to be picked up; normally, he would have carried a sack lunch. Unlike most Fridays, he told Frazier he would not need a ride home that night. And then there was the long, paper-wrapped package in the backseat. When Frazier asked, Oswald said it contained curtain rods. (AP Photo/LM Otero)
FILE - In this Friday, Nov. 22, 1963 file photo, seen through the foreground convertibles windshield, President John F. Kennedys hand reaches toward his head within seconds of being fatally shot as first lady Jacqueline Kennedy holds his forearm as the motorcade proceeds along Elm Street past the Texas School Book Depository in Dallas. Gov. John Connally was also shot. (AP PhotoJames W. Ike Altgens)
FILE - In this Friday, Nov. 22, 1963 file photo, seen through the foreground convertible's windshield, President John F. Kennedy's hand reaches toward his head within seconds of being fatally shot as first lady Jacqueline Kennedy holds his forearm as the motorcade proceeds along Elm Street past the Texas School Book Depository in Dallas. Gov. John Connally was also shot. (AP Photo/James W. "Ike" Altgens)
FILE - In this Friday, Nov. 22, 1963 file photo, President John F. Kennedy slumps down in the back seat of the Presidential limousine as it speeds along Elm Street toward the Stemmons Freeway overpass in Dallas after being fatally shot. First lady Jacqueline Kennedy leans over the president as Secret Service agent Clint Hill pushes her back to her seat. Shes going to go flying off the back of the car, Hill thought as he tried to secure the first lady. (AP PhotoJames W. Ike Altgens)
FILE - In this Friday, Nov. 22, 1963 file photo, President John F. Kennedy slumps down in the back seat of the Presidential limousine as it speeds along Elm Street toward the Stemmons Freeway overpass in Dallas after being fatally shot. First lady Jacqueline Kennedy leans over the president as Secret Service agent Clint Hill pushes her back to her seat. "She's going to go flying off the back of the car," Hill thought as he tried to secure the first lady. (AP Photo/James W. "Ike" Altgens)
FILE - In this Dec. 3, 1963 file photo, James W. Ike Altgens, Associated Press Wirephoto operator-photographer, holds prints of the photographs he made of the Friday, Nov. 22, 1963 assassination of President John F. Kennedy in Dallas. He recorded the Dealey Plaza chaos - including images of Kennedy grasping his throat and of Secret Service agent Clint Hill reaching for the first lady across the limos trunk. (AP PhotoDave Taylor)
FILE - In this Dec. 3, 1963 file photo, James W. "Ike" Altgens, Associated Press Wirephoto operator-photographer, holds prints of the photographs he made of the Friday, Nov. 22, 1963 assassination of President John F. Kennedy in Dallas. He recorded the Dealey Plaza chaos - including images of Kennedy grasping his throat and of Secret Service agent Clint Hill reaching for the first lady across the limo's trunk. (AP Photo/Dave Taylor)
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In this Oct. 21, 2013 photo, Dr. Michael Ellsasser of Lubbock, Texas, formerly of the Dallas Parkland Memorial Hospital, holds one of Jacqueline Kennedys roses, which he encased in Lucite. In the empty trauma room after President John F. Kennedy died, two young residents noticed the first ladys roses, discarded and bloodstained. Each picked up one, and would preserve the flowers. You cant really tell what it is, says Ellsasser, but I still have it anyhow. (AP PhotoBetsy Blaney)
In this Oct. 21, 2013 photo, Dr. Michael Ellsasser of Lubbock, Texas, formerly of the Dallas Parkland Memorial Hospital, holds one of Jacqueline Kennedy's roses, which he encased in Lucite. In the empty trauma room after President John F. Kennedy died, two young residents noticed the first lady's roses, discarded and bloodstained. Each picked up one, and would preserve the flowers. "You can't really tell what it is," says Ellsasser, "but I still have it anyhow." (AP Photo/Betsy Blaney)
This Thursday, Oct. 31, 2013 photo of an Associated Press teletype news bulletin from Friday, Nov. 22, 1963 shows news that President Kennedy had been shot in Dallas. The document is in the AP Corporate Archives in New York. (AP PhotoMark Lennihan)
This Thursday, Oct. 31, 2013 photo of an Associated Press teletype news bulletin from Friday, Nov. 22, 1963 shows news that President Kennedy had been shot in Dallas. The document is in the AP Corporate Archives in New York. (AP Photo/Mark Lennihan)
This Thursday, Oct. 31, 2013 photo of an Associated Press teletype news bulletin from Friday, Nov. 22, 1963 shows news that President Kennedy had died after being shot in Dallas. The message reads, TWO PRIESTS STEPPED OUT OF PARKLAND HOSPITALS EMERGENCY WARD TODAY AND SAID PRESIDENT KENNEDY DIED OF HIS BULLET WOUNDS. The document is located in the AP Corporate Archives in New York. (AP PhotoMark Lennihan)
This Thursday, Oct. 31, 2013 photo of an Associated Press teletype news bulletin from Friday, Nov. 22, 1963 shows news that President Kennedy had died after being shot in Dallas. The message reads, "TWO PRIESTS STEPPED OUT OF PARKLAND HOSPITAL'S EMERGENCY WARD TODAY AND SAID PRESIDENT KENNEDY DIED OF HIS BULLET WOUNDS." The document is located in the AP Corporate Archives in New York. (AP Photo/Mark Lennihan)
In this Oct. 3, 2013 photo, Dr. Ronald C. Jones speaks during an interview in his office at Baylor University Medical Center in Dallas. Jones was the 31-year-old chief resident at Parkland Memorial Hospital on Friday, Nov. 22, 1963 and one of the doctors who worked to save President John F. Kennedys life after being shot by Lee Harvey Oswald. Through the open door of the trauma room, Jones saw a stoic Jackie Kennedy, moving from a folding chair placed for her outside the room to standing quietly inside as doctors assessed her husband. His eyes were open, they were not moving, says Jones. (AP PhotoBenny Snyder)
In this Oct. 3, 2013 photo, Dr. Ronald C. Jones speaks during an interview in his office at Baylor University Medical Center in Dallas. Jones was the 31-year-old chief resident at Parkland Memorial Hospital on Friday, Nov. 22, 1963 and one of the doctors who worked to save President John F. Kennedy's life after being shot by Lee Harvey Oswald. Through the open door of the trauma room, Jones saw a stoic Jackie Kennedy, moving from a folding chair placed for her outside the room to standing quietly inside as doctors assessed her husband. "His eyes were open, they were not moving," says Jones. (AP Photo/Benny Snyder)
FILE - In this Friday, Nov. 22, 1963 file photo, a U.S. flag flies at half-staff in front of Parkland Memorial Hospital in Dallas where President John F. Kennedy was declared dead after being shot. When the end came, eyes turned to Jacqueline Kennedy at her husbands side. Dr. Robert McClelland recalls a kiss. Dr. Kenneth Salyer, who had done external cardiac massage, says, She sort of laid on his chest ... in a sort of compassionate motion. (AP PhotoRAJ)
FILE - In this Friday, Nov. 22, 1963 file photo, a U.S. flag flies at half-staff in front of Parkland Memorial Hospital in Dallas where President John F. Kennedy was declared dead after being shot. When the end came, eyes turned to Jacqueline Kennedy at her husbandís side. Dr. Robert McClelland recalls a kiss. Dr. Kenneth Salyer, who had done external cardiac massage, says, "She sort of laid on his chest ... in a sort of compassionate motion." (AP Photo/RAJ)
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FILE - In this Friday, Nov. 22, 1963 file photo, women burst into tears outside Parkland Hospital upon hearing that President John F. Kennedy died from a shooting while riding in a motorcade in Dallas. (AP PhotoFile)
FILE - In this Friday, Nov. 22, 1963 file photo, women burst into tears outside Parkland Hospital upon hearing that President John F. Kennedy died from a shooting while riding in a motorcade in Dallas. (AP Photo/File)
FILE - In this Monday, Nov. 25, 1963 file photo, Marie Tippit, widow of police officer J.D. Tippit who was slain during the search for President John F. Kennedys assassin, is led weeping from Beckley Hills Baptist Church in Dallas after funeral services for her husband. The services began about the time those for Kennedy were ending in Washington. (AP Photo)
FILE - In this Monday, Nov. 25, 1963 file photo, Marie Tippit, widow of police officer J.D. Tippit who was slain during the search for President John F. Kennedy's assassin, is led weeping from Beckley Hills Baptist Church in Dallas after funeral services for her husband. The services began about the time those for Kennedy were ending in Washington. (AP Photo)
FILE - In this Friday, Nov. 22, 1963 photo from the White House via the John Fitzgerald Kennedy Library in Boston, Lyndon B. Johnson is sworn in as president as Jacqueline Kennedy stands at his side in the cabin of the presidential plane on the ground at Love Field in Dallas. Judge Sarah T. Hughes, a Kennedy appointee to the Federal court, left, administers the oath. In background, from left are, Associate Press Secretary Malcolm Kilduff, holding microphone Jack Valenti, administrative assistant to Johnson Rep. Albert Thomas, D-Texas. Lady Bird Johnson and Rep. Jack Brooks, D-Texas. (AP PhotoWhite House, Cecil Stoughton, via the John Fitzgerald Kennedy Library, Boston)
FILE - In this Friday, Nov. 22, 1963 photo from the White House via the John Fitzgerald Kennedy Library in Boston, Lyndon B. Johnson is sworn in as president as Jacqueline Kennedy stands at his side in the cabin of the presidential plane on the ground at Love Field in Dallas. Judge Sarah T. Hughes, a Kennedy appointee to the Federal court, left, administers the oath. In background, from left are, Associate Press Secretary Malcolm Kilduff, holding microphone; Jack Valenti, administrative assistant to Johnson; Rep. Albert Thomas, D-Texas.; Lady Bird Johnson; and Rep. Jack Brooks, D-Texas. (AP Photo/White House, Cecil Stoughton, via the John Fitzgerald Kennedy Library, Boston)
FILE - In this Friday, Nov. 22, 1963 file photo, Jacqueline Kennedy, with bloodstains on her clothes, holds hands with her brother-in-law, Attorney General Robert Kennedy, as the coffin carrying the body of President John F. Kennedy is placed in an ambulance after arriving at Andrews Air Force Base, Md. near Washington. President Kennedy was assassinated earlier that afternoon in Dallas. (AP Photo)
FILE - In this Friday, Nov. 22, 1963 file photo, Jacqueline Kennedy, with bloodstains on her clothes, holds hands with her brother-in-law, Attorney General Robert Kennedy, as the coffin carrying the body of President John F. Kennedy is placed in an ambulance after arriving at Andrews Air Force Base, Md. near Washington. President Kennedy was assassinated earlier that afternoon in Dallas. (AP Photo)
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FILE - In this Saturday, Nov. 23, 1963 file photo, the flag-draped casket of President John F. Kennedy lies in state in the East Room of the White House in Washington. Jackie Kennedy sent word that she wanted the East Room, where the president would lie in state, to look as it did when Lincolns body lay there, remembers Richard Goodwin, a speechwriter and adviser to the administration. He and others went to work. Someone was sent to the Library of Congress for a sketch and a newspaper description from Lincolns time artists and upholsterers were called in, and black crepe was carefully hung. In the midst of all these activities we would alternately break down in tears, Goodwin says. (AP Photo)
FILE - In this Saturday, Nov. 23, 1963 file photo, the flag-draped casket of President John F. Kennedy lies in state in the East Room of the White House in Washington. "Jackie Kennedy sent word that she wanted the East Room, where the president would lie in state, to look as it did when Lincoln's body lay there," remembers Richard Goodwin, a speechwriter and adviser to the administration. He and others went to work. Someone was sent to the Library of Congress for a sketch and a newspaper description from Lincoln's time; artists and upholsterers were called in, and black crepe was carefully hung. "In the midst of all these activities we would alternately break down in tears," Goodwin says. (AP Photo)
A small new exhibit at the John F. Kennedy Library and Museum marking the 50th anniversary of the assassination of the 35th President of the United States includes never-before-displayed artifacts from his three-day state funeral, such as the American flag which draped the presidents casket presented with a photograph of first lady Jacqueline Bouvier Kennedy during her husbands funeral in Boston, Thursday, Nov. 14, 2013. (AP PhotoStephan Savoia)
A small new exhibit at the John F. Kennedy Library and Museum marking the 50th anniversary of the assassination of the 35th President of the United States includes never-before-displayed artifacts from his three-day state funeral, such as the American flag which draped the president's casket presented with a photograph of first lady Jacqueline Bouvier Kennedy during her husband's funeral in Boston, Thursday, Nov. 14, 2013. (AP Photo/Stephan Savoia)
A small new exhibit at the John F. Kennedy Library and Museum marking the 50th anniversary of the assassination of the 35th President of the United States includes never-before-displayed artifacts from his three-day state funeral, such as the saddle, boots and sword which sat atop the riderless horse in Kennedys funeral procession in Boston, Thursday, Nov. 14, 2013. The riderless horse is symbolic of a fallen leader who will never ride again. (AP PhotoStephan Savoia)
A small new exhibit at the John F. Kennedy Library and Museum marking the 50th anniversary of the assassination of the 35th President of the United States includes never-before-displayed artifacts from his three-day state funeral, such as the saddle, boots and sword which sat atop the riderless horse in Kennedy's funeral procession in Boston, Thursday, Nov. 14, 2013. The riderless horse is symbolic of a fallen leader who will never ride again. (AP Photo/Stephan Savoia)
A small new exhibit at the John F. Kennedy Library and Museum marking the 50th anniversary of the assassination of the 35th President of the United States includes never-before-displayed artifacts from his three-day state funeral, such as this green beret laid at the grave of the fallen president by Sgt. Maj. Francis Ruddy, a Special Forces Soldier, three days after Kennedys assignation in Boston, Thursday, Nov. 14, 2013. (AP PhotoStephan Savoia)
A small new exhibit at the John F. Kennedy Library and Museum marking the 50th anniversary of the assassination of the 35th President of the United States includes never-before-displayed artifacts from his three-day state funeral, such as this "green beret" laid at the grave of the fallen president by Sgt. Maj. Francis Ruddy, a Special Forces Soldier, three days after Kennedy's assignation in Boston, Thursday, Nov. 14, 2013. (AP Photo/Stephan Savoia)
Mike Cochran poses holding a photo Friday, Nov. 15, 2013, at his home in Haltom City, Texas, that shows him and other reporters serving as pallbearers. On a gloomy November afternoon, I helped carry the inexpensive wooden casket of Lee Harvey Oswald to a grave on a slight rise dotted with dying grass. (AP PhotoTony Gutierrez)
Mike Cochran poses holding a photo Friday, Nov. 15, 2013, at his home in Haltom City, Texas, that shows him and other reporters serving as pallbearers. On a gloomy November afternoon, I helped carry the inexpensive wooden casket of Lee Harvey Oswald to a grave on a slight rise dotted with dying grass. (AP Photo/Tony Gutierrez)
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This image of a Texas Department of State Health Services document provided by Ancestry.com on Nov. 14, 2013 shows the death certificate of President John F. Kennedy who died on Friday, Nov. 22, 1963. (AP PhotoTexas Department of State Health Services via Ancestry.com)
This image of a Texas Department of State Health Services document provided by Ancestry.com on Nov. 14, 2013 shows the death certificate of President John F. Kennedy who died on Friday, Nov. 22, 1963. (AP Photo/Texas Department of State Health Services via Ancestry.com)
Tampa Mayor Bob Buckhorn, right, and 6th Air Mobility Wing Commander Col. Scott DeThomas unveil a plaque that will honors President John F. Kennedy Monday, Nov. 18, 2013, at MacDill Air Force Base in Tampa, Fla. Kennedy was visiting Tampa 50-years ago today, four days before his assassination in Dallas. The plaque will be placed in downtown Tampa. (AP PhotoChris OMeara)
Tampa Mayor Bob Buckhorn, right, and 6th Air Mobility Wing Commander Col. Scott DeThomas unveil a plaque that will honors President John F. Kennedy Monday, Nov. 18, 2013, at MacDill Air Force Base in Tampa, Fla. Kennedy was visiting Tampa 50-years ago today, four days before his assassination in Dallas. The plaque will be placed in downtown Tampa. (AP Photo/Chris O'Meara)
Service personnel watch a slideshow of President John F. Kennedys 1963 visit to Tampa Monday, Nov. 18, 2013, at MacDill Air Force Base in Tampa, Fla. A plaque honoring Kennedy was unveiled during a ceremony at the base. Kennedy was visiting Tampa 50-years ago today, four days before his assassination in Dallas. The plaque will be placed in downtown Tampa. (AP PhotoChris OMeara)
Service personnel watch a slideshow of President John F. Kennedy's 1963 visit to Tampa Monday, Nov. 18, 2013, at MacDill Air Force Base in Tampa, Fla. A plaque honoring Kennedy was unveiled during a ceremony at the base. Kennedy was visiting Tampa 50-years ago today, four days before his assassination in Dallas. The plaque will be placed in downtown Tampa. (AP Photo/Chris O'Meara)
This undated photo provided by Christies shows the wristwatch believed to have been worn by the neurosurgeon who signed John F. Kennedys death certificate and an original certificate from the watchmaker. The 18-carat Patek Philippe timepiece is going on the auction block in New York City where it is estimated to bring up to 150,000 at Christies on Dec. 17. (AP PhotoChristies)
This undated photo provided by Christie's shows the wristwatch believed to have been worn by the neurosurgeon who signed John F. Kennedy's death certificate and an original certificate from the watchmaker. The 18-carat Patek Philippe timepiece is going on the auction block in New York City where it is estimated to bring up to $150,000 at Christie's on Dec. 17. (AP Photo/Christie's)
This undated photo provided by Christies shows the wristwatch believed to have been worn by the neurosurgeon who signed John F. Kennedys death certificate. The 18-carat Patek Philippe timepiece is going on the auction block in New York City where it is estimated to bring up to 150,000 at Christies on Dec. 17, 2013. (AP PhotoChristies)
This undated photo provided by Christie's shows the wristwatch believed to have been worn by the neurosurgeon who signed John F. Kennedy's death certificate. The 18-carat Patek Philippe timepiece is going on the auction block in New York City where it is estimated to bring up to $150,000 at Christie's on Dec. 17, 2013. (AP Photo/Christie's)
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FILE- In this Nov. 12, 2013 file photo, an X marks the spot on Elm Street where the first bullet hit President John F. Kennedy on Nov. 22, 1963 near the former Texas School Book Depository, now known as the Sixth Floor Museum, background, on Dealey Plaza in Dallas. The Xs on the street are gone. The disappearance of the marks come as the city on Friday is set to mark the 50th anniversary of the assassination of John F. Kennedy with a solemn ceremony in Dealey Plaza. (AP PhotoLM Otero, File)
FILE- In this Nov. 12, 2013 file photo, an X marks the spot on Elm Street where the first bullet hit President John F. Kennedy on Nov. 22, 1963 near the former Texas School Book Depository, now known as the Sixth Floor Museum, background, on Dealey Plaza in Dallas. The Xs on the street are gone. The disappearance of the marks come as the city on Friday is set to mark the 50th anniversary of the assassination of John F. Kennedy with a solemn ceremony in Dealey Plaza. (AP Photo/LM Otero, File)
A small image of the Blessed Virgin Mary sits on the stone surrounding the eternal flame and gravesite of President John F. Kennedy, Tuesday, Nov. 19, 2013, at Arlington National Cemetery in Arlington, Va. Friday, Nov. 22, will make the 50th anniversary of the assassination of President Kennedy in Dallas. The Arlington House, the Robert E. Lee Memorial sits at the top of the hill overlooking the gravesite. (AP PhotoCarolyn Kaster)
A small image of the Blessed Virgin Mary sits on the stone surrounding the eternal flame and gravesite of President John F. Kennedy, Tuesday, Nov. 19, 2013, at Arlington National Cemetery in Arlington, Va. Friday, Nov. 22, will make the 50th anniversary of the assassination of President Kennedy in Dallas. The Arlington House, the Robert E. Lee Memorial sits at the top of the hill overlooking the gravesite. (AP Photo/Carolyn Kaster)
The eternal flame burns atop at the gravesite of President John F. Kennedy at Arlington National Cemetery in Arlington, Va., Tuesday, Nov. 19, 2013. Friday, Nov. 22, will mark the 50th anniversary of Kennedys assassination in Dallas. (AP PhotoCarolyn Kaster)
The eternal flame burns atop at the gravesite of President John F. Kennedy at Arlington National Cemetery in Arlington, Va., Tuesday, Nov. 19, 2013. Friday, Nov. 22, will mark the 50th anniversary of Kennedy's assassination in Dallas. (AP Photo/Carolyn Kaster)
President Barack Obama and first lady Michelle Obama greet Ethel Kennedy, widow of Robert F. Kennedy, and other members of the Kennedy family, following a wreath laying ceremony in honor of President John F. Kennedy, Wednesday, Nov. 20, 2013, at the JFK gravesite at Arlington National Cemetery in Arlington, Va. Friday will mark the 50th anniversary of the JFK assassination. (AP PhotoPablo Martinez Monsivais)
President Barack Obama and first lady Michelle Obama greet Ethel Kennedy, widow of Robert F. Kennedy, and other members of the Kennedy family, following a wreath laying ceremony in honor of President John F. Kennedy, Wednesday, Nov. 20, 2013, at the JFK gravesite at Arlington National Cemetery in Arlington, Va. Friday will mark the 50th anniversary of the JFK assassination. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama, first lady Michelle Obama, former President Bill Clinton and his wife, former Secretary of State Hillary Rodham Clinton, pause during a wreath laying ceremony in honor of President John F. Kennedy, Wednesday, Nov. 20, 2013, at the JFK gravesite at Arlington National Cemetery in Arlington, Va. Friday will mark the 50th anniversary of the JFK assassination. (AP PhotoPablo Martinez Monsivais)
President Barack Obama, first lady Michelle Obama, former President Bill Clinton and his wife, former Secretary of State Hillary Rodham Clinton, pause during a wreath laying ceremony in honor of President John F. Kennedy, Wednesday, Nov. 20, 2013, at the JFK gravesite at Arlington National Cemetery in Arlington, Va. Friday will mark the 50th anniversary of the JFK assassination. (AP Photo/Pablo Martinez Monsivais)
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FILE - In this Nov. 22, 2008, file photo, an observer takes a picture with his cell phone from behind the wooden fence on top of the grassy knoll at Dealey Plaza in Dallas, at the 45th anniversary of the assassination of President John F. Kennedy. Loose gatherings of the curious and conspiracy-minded have marked past anniversaries of the assassination of President Kennedy. But in the place where the presidents motorcade passed through and shots rang out on Nov. 22, 1963, a solemn ceremony on the 50th anniversary of his death is designed to avoid such distractions, with brief remarks by the mayor and the tolling of church bells. (AP PhotoThe Dallas Morning News, Lara Solt)
FILE - In this Nov. 22, 2008, file photo, an observer takes a picture with his cell phone from behind the wooden fence on top of the grassy knoll at Dealey Plaza in Dallas, at the 45th anniversary of the assassination of President John F. Kennedy. Loose gatherings of the curious and conspiracy-minded have marked past anniversaries of the assassination of President Kennedy. But in the place where the president's motorcade passed through and shots rang out on Nov. 22, 1963, a solemn ceremony on the 50th anniversary of his death is designed to avoid such distractions, with brief remarks by the mayor and the tolling of church bells. (AP Photo/The Dallas Morning News, Lara Solt)
FILE - In this Nov. 22, 1995, file photo, people pause during a moment of silence at Dealey Plaza in Dallas, where President John F. Kennedy was assassinated. Loose gatherings of the curious and conspiracy-minded have marked past anniversaries of the assassination of President Kennedy. But in the place where the presidents motorcade passed through and shots rang out on Nov. 22, 1963, a solemn ceremony on the 50th anniversary of his death is designed to avoid such distractions, with brief remarks by the mayor and the tolling of church bells. (AP PhotoTim Sharp, File)
FILE - In this Nov. 22, 1995, file photo, people pause during a moment of silence at Dealey Plaza in Dallas, where President John F. Kennedy was assassinated. Loose gatherings of the curious and conspiracy-minded have marked past anniversaries of the assassination of President Kennedy. But in the place where the president's motorcade passed through and shots rang out on Nov. 22, 1963, a solemn ceremony on the 50th anniversary of his death is designed to avoid such distractions, with brief remarks by the mayor and the tolling of church bells. (AP Photo/Tim Sharp, File)
Leo Seide, 84, Grand Blanc, Mich., resident who was a local organizer for John F. Kennedys 1962 visit to Flint, Mich., sits with a sketched portrait of the president on Thursday, Nov. 21, 2013. Friday will be the 50th anniversary of Kennedys assassination. Seide met the president and still has a signed thank you letter hanging in his office. (AP PhotoThe Flint Journal, Jake May)
Leo Seide, 84, Grand Blanc, Mich., resident who was a local organizer for John F. Kennedy's 1962 visit to Flint, Mich., sits with a sketched portrait of the president on Thursday, Nov. 21, 2013. Friday will be the 50th anniversary of Kennedy's assassination. Seide met the president and still has a signed thank you letter hanging in his office. (AP Photo/The Flint Journal, Jake May)
FILE - In a Nov. 24, 1963, file photo President John F. Kennedy assassin Lee Harvey Oswald, center in handcuffs, is shot by Jack Ruby, foreground, in the underground garage of the Dallas police headquarters. Oswald died at Parkland Hospital several hours later. His body was buried and then exhumed in 1981 to put to rest theories that Oswalds body wasnt actually there. (AP PhotoJack Beers, File) (AP PhotoThe Dallas Morning News, )
FILE - In a Nov. 24, 1963, file photo President John F. Kennedy assassin Lee Harvey Oswald, center in handcuffs, is shot by Jack Ruby, foreground, in the underground garage of the Dallas police headquarters. Oswald died at Parkland Hospital several hours later. His body was buried and then exhumed in 1981 to put to rest theories that Oswald's body wasn't actually there. (AP Photo/Jack Beers, File) (AP Photo/The Dallas Morning News, )
File - In this Oct. 15, 2013 file photo, the white cotton shirt and black suit worn by Texas Gov. John Connally on the day gunfire wounded him and killed President John F. Kennedy in Dallas, Texas on Nov. 22, 1963, is pictured at the Texas State Library and Archives Commission in Austin, Texas. (AP PhotoTamir Kalifa, File)
File - In this Oct. 15, 2013 file photo, the white cotton shirt and black suit worn by Texas Gov. John Connally on the day gunfire wounded him and killed President John F. Kennedy in Dallas, Texas on Nov. 22, 1963, is pictured at the Texas State Library and Archives Commission in Austin, Texas. (AP Photo/Tamir Kalifa, File)
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File - In this Nov. 25, 1963 file photo, the caisson bearing the flag-draped coffin of President John F. Kennedy, is shown leaving the White House in procession down Pennsylvania Avenue, in Washington, en route to Arlington National Cemetery. (AP Photo, File)
File - In this Nov. 25, 1963 file photo, the caisson bearing the flag-draped coffin of President John F. Kennedy, is shown leaving the White House in procession down Pennsylvania Avenue, in Washington, en route to Arlington National Cemetery. (AP Photo, File)
File - In this Nov. 24, 1963 file photo, Jacqueline Kennedy walks down the Capitol steps with her daughter Caroline and son John Jr. after President John. F. Kennedys casket was placed in the rotunda in Washington Nov. 24, 1963. (AP Photo, File)
File - In this Nov. 24, 1963 file photo, Jacqueline Kennedy walks down the Capitol steps with her daughter Caroline and son John Jr. after President John. F. Kennedy's casket was placed in the rotunda in Washington Nov. 24, 1963. (AP Photo, File)
Richland track coach Jim Qualheim poses for a photo as he holds a copy of President John F. Kennedys 1960 campaign for president sign he received when he was 12-years-old while going door to door spreading leaflets with his family on Thursday, Nov. 21, 2013. (AP PhotoThe Tri-City Herald, Paul T. Erickson)
Richland track coach Jim Qualheim poses for a photo as he holds a copy of President John F. Kennedy's 1960 campaign for president sign he received when he was 12-years-old while going door to door spreading leaflets with his family on Thursday, Nov. 21, 2013. (AP Photo/The Tri-City Herald, Paul T. Erickson)
Flowers are left at the National Historic Landmark marker in Dealey Plaza, on Thursday Nov. 21, 2013 in Dallas. Nov. 22, 2013 will be the 50th anniversary of the assassination of President John F. Kennedy. (AP PhotoThe Dallas Morning News, Sarah Hoffman)
Flowers are left at the National Historic Landmark marker in Dealey Plaza, on Thursday Nov. 21, 2013 in Dallas. Nov. 22, 2013 will be the 50th anniversary of the assassination of President John F. Kennedy. (AP Photo/The Dallas Morning News, Sarah Hoffman/)
Workers secure a large American flag to the side of the new Parkland Memorial Hospital building Thursday, Nov. 21, 2013 in Dallas. The flag is part of other moves across the city to commemorate the 50th anniversary of the assassination of President John F. Kennedy, which is Friday. (AP PhotoThe Dallas Morning News, G.J. McCarthy)
Workers secure a large American flag to the side of the new Parkland Memorial Hospital building Thursday, Nov. 21, 2013 in Dallas. The flag is part of other moves across the city to commemorate the 50th anniversary of the assassination of President John F. Kennedy, which is Friday. (AP Photo/The Dallas Morning News, G.J. McCarthy)
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Clare Calvin, left, a colouring assistant with Madame Tussauds tourist attraction poses for the photographers next to the wax figure of U.S. President John F. Kennedy in the World Leaders area at Madame Tussauds tourist attraction, in London, Thursday, Nov. 21, 2013. Friday, Nov. 22, 2013 will mark the 50th anniversary of the JFK assassination. According to Madame Tussauds, the wax figure of the 35th President of the United States remains a popular feature in the attraction five decades after his death. (AP PhotoLefteris Pitarakis)
Clare Calvin, left, a colouring assistant with Madame Tussauds tourist attraction poses for the photographers next to the wax figure of U.S. President John F. Kennedy in the World Leaders area at Madame Tussauds tourist attraction, in London, Thursday, Nov. 21, 2013. Friday, Nov. 22, 2013 will mark the 50th anniversary of the JFK assassination. According to Madame Tussauds, the wax figure of the 35th President of the United States remains a popular feature in the attraction five decades after his death. (AP Photo/Lefteris Pitarakis)
Clare Calvin, left, a colouring assistant with Madame Tussauds tourist attraction, poses for photographers next to the wax figures of the 35th U.S. President, John F. Kennedy, center, and the figure of current President Barack Obama, right, in the World Leaders area at Madame Tussauds tourist attraction, in London, Thursday, Nov. 21, 2013. Friday, Nov. 22, 2013 will mark the 50th anniversary of the JFK assassination. According to Madame Tussauds, the wax figure of the 35th President of the United States remains a popular feature in the attraction five decades after his death. (AP PhotoLefteris Pitarakis)
Clare Calvin, left, a colouring assistant with Madame Tussauds tourist attraction, poses for photographers next to the wax figures of the 35th U.S. President, John F. Kennedy, center, and the figure of current President Barack Obama, right, in the World Leaders area at Madame Tussauds tourist attraction, in London, Thursday, Nov. 21, 2013. Friday, Nov. 22, 2013 will mark the 50th anniversary of the JFK assassination. According to Madame Tussauds, the wax figure of the 35th President of the United States remains a popular feature in the attraction five decades after his death. (AP Photo/Lefteris Pitarakis)
A photo of JKF and flowers lay on a plaque at Dealey Plaza in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP PhotoLM Otero)
A photo of JKF and flowers lay on a plaque at Dealey Plaza in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas' Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP Photo/LM Otero)
Carlos Flores holds a copy of the Dallas Morning News as work crews finish up street work on Dealey Plaza in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP PhotoLM Otero)
Carlos Flores holds a copy of the Dallas Morning News as work crews finish up street work on Dealey Plaza in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas' Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP Photo/LM Otero)
A Dallas Police Officer stands guard over a plaque to be unveiled on the grassy knoll at Dealey Plaza in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP PhotoLM Otero)
A Dallas Police Officer stands guard over a plaque to be unveiled on the grassy knoll at Dealey Plaza in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas' Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP Photo/LM Otero)
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Conception Lavalle sweeps up the stage area set up on Dealey Plaza for the JFK anniversary event in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP PhotoLM Otero)
Conception Lavalle sweeps up the stage area set up on Dealey Plaza for the JFK anniversary event in Dallas, Thursday, Nov. 21, 2013. Loose gatherings of the curious and conspiracy-minded at Dallas' Dealey Plaza have marked past anniversaries of the assassination of President John F. Kennedy. But for the 50th anniversary, the city of Dallas has planned a solemn ceremony Friday in the plaza he was passing through when shots rang out. There will be brief remarks by the mayor and the tolling of church bells. (AP Photo/LM Otero)
pectators view the presidential limousine of John F. Kennedy that is on display at The Henry Ford in Dearborn, Mich., Thursday, Nov. 21, 2013. Friday marks the 50th anniversary of the presidents assassination in Dallas. (AP PhotoPaul Sancya)
pectators view the presidential limousine of John F. Kennedy that is on display at The Henry Ford in Dearborn, Mich., Thursday, Nov. 21, 2013. Friday marks the 50th anniversary of the president's assassination in Dallas. (AP Photo/Paul Sancya)
FILE - This May 22, 1964 photo shows Dealey Plaza where U.S. President John F. Kennedy traveled down when shots claimed his life. The building at left is the Texas School Book Depository Building where Lee Harvery Oswald was determined to have fired the shots. (AP PhotoFile)
FILE - This May 22, 1964 photo shows Dealey Plaza where U.S. President John F. Kennedy traveled down when shots claimed his life. The building at left is the Texas School Book Depository Building where Lee Harvery Oswald was determined to have fired the shots. (AP Photo/File)
File - In this Nov. 12, 2013 file photo, the former Texas School Book Depository building, left, now known as the Sixth Floor Museum overlooks Dealey Plaza in Dallas, where Lee Harvery Oswald fired from the building killing President John F. Kennedy on Nov. 22, 1963. (AP PhotoLM Otero, File)
File - In this Nov. 12, 2013 file photo, the former Texas School Book Depository building, left, now known as the Sixth Floor Museum overlooks Dealey Plaza in Dallas, where Lee Harvery Oswald fired from the building killing President John F. Kennedy on Nov. 22, 1963. (AP Photo/LM Otero, File)
File - This Oct. 31, 2013 shows the seat that Lee Harvey Oswald was sitting in when Dallas Police arrested him is illuminated at the Texas Theatre in the Oak Cliff section of Dallas. Oswald was arrested here on Nov. 22, 1963, after the assassination of President John F. Kennedy. (AP PhotoLM Otero, File)
File - This Oct. 31, 2013 shows the seat that Lee Harvey Oswald was sitting in when Dallas Police arrested him is illuminated at the Texas Theatre in the Oak Cliff section of Dallas. Oswald was arrested here on Nov. 22, 1963, after the assassination of President John F. Kennedy. (AP Photo/LM Otero, File)
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File - This Nov. 22, 1963 file photo shows the movie theater where Lee Harvey Oswald was arrested after U.S. President John F. Kennedy was shot and killed in Dallas. (AP PhotoFile)
File - This Nov. 22, 1963 file photo shows the movie theater where Lee Harvey Oswald was arrested after U.S. President John F. Kennedy was shot and killed in Dallas. (AP Photo/File)
FILE - In this Monday, Nov. 25, 1963 file photo, Jacqueline Kennedy, widow of assassinated President John F. Kennedy, holds the U.S. flag that covered the coffin of her husband at Arlington National Cemetery in Arlington, Va. after he was buried. (AP PhotoEddie Adams, File)
FILE - In this Monday, Nov. 25, 1963 file photo, Jacqueline Kennedy, widow of assassinated President John F. Kennedy, holds the U.S. flag that covered the coffin of her husband at Arlington National Cemetery in Arlington, Va. after he was buried. (AP Photo/Eddie Adams, File)
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedys motorcade travels through Dallas. (AP PhotoPRNewsFotoNewseum, File)
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedy's motorcade travels through Dallas. (AP Photo/PRNewsFoto/Newseum, File)
FILE - In this Monday, Nov. 25, 1963 file photo, 3-year-old John F. Kennedy Jr. salutes his fathers casket in Washington, three days after the president was assassinated in Dallas. Widow Jacqueline Kennedy, center, and daughter Caroline Kennedy are accompanied by the late presidents brothers Sen. Edward Kennedy, left, and Attorney General Robert Kennedy. (AP PhotoFile)
FILE - In this Monday, Nov. 25, 1963 file photo, 3-year-old John F. Kennedy Jr. salutes his father's casket in Washington, three days after the president was assassinated in Dallas. Widow Jacqueline Kennedy, center, and daughter Caroline Kennedy are accompanied by the late president's brothers Sen. Edward Kennedy, left, and Attorney General Robert Kennedy. (AP Photo/File)
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FILE - In this Nov. 22, 1963 file photo, the limousine carrying mortally wounded President John F. Kennedy races toward the hospital seconds after he was shot in Dallas. Secret Service agent Clinton Hill is riding on the back of the car, Nellie Connally, wife of Texas Gov. John Connally, bends over her wounded husband, and first lady Jacqueline Kennedy leans over the president. (AP PhotoJustin Newman, File)
FILE - In this Nov. 22, 1963 file photo, the limousine carrying mortally wounded President John F. Kennedy races toward the hospital seconds after he was shot in Dallas. Secret Service agent Clinton Hill is riding on the back of the car, Nellie Connally, wife of Texas Gov. John Connally, bends over her wounded husband, and first lady Jacqueline Kennedy leans over the president. (AP Photo/Justin Newman, File)
A Japanese TV crew gives a report by a portrait of the late U.S. President John F. Kennedy at a memorial venue specially set for his Japanese fans in Tokyo Friday, Nov. 22, 2013 to mark the 50th anniversary of his assassination. Japanese JFK fans took photos with his portrait, folded paper cranes and watched his inaugural ceremony on a monitor Friday to express admiration on the anniversary. (AP PhotoShuji Kajiyama)
A Japanese TV crew gives a report by a portrait of the late U.S. President John F. Kennedy at a memorial venue specially set for his Japanese fans in Tokyo Friday, Nov. 22, 2013 to mark the 50th anniversary of his assassination. Japanese JFK fans took photos with his portrait, folded paper cranes and watched his inaugural ceremony on a monitor Friday to express admiration on the anniversary. (AP Photo/Shuji Kajiyama)
A Japanese visitor offers a paper crane folded by her to pay her respects to the late U.S. President John F. Kennedy at a memorial venue specially set up for his Japanese fans in Tokyo Friday, Nov. 22, 2013 to mark the 50th anniversary of his assassination. Japanese JFK fans took photos with his portrait, folded paper cranes and watched his inaugural ceremony on a monitor Friday to express admiration on the anniversary. (AP PhotoShuji Kajiyama)
A Japanese visitor offers a paper crane folded by her to pay her respects to the late U.S. President John F. Kennedy at a memorial venue specially set up for his Japanese fans in Tokyo Friday, Nov. 22, 2013 to mark the 50th anniversary of his assassination. Japanese JFK fans took photos with his portrait, folded paper cranes and watched his inaugural ceremony on a monitor Friday to express admiration on the anniversary. (AP Photo/Shuji Kajiyama)
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedy and first lady Jacqueline Kennedy greet people on their arrival at the Dallas Airport (Love Field). (AP PhotoHWB, File)
FILE - In this Nov. 22, 1963 file photo, President John F. Kennedy and first lady Jacqueline Kennedy greet people on their arrival at the Dallas Airport (Love Field). (AP Photo/HWB, File)
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