Memorial ceremonies throughout the U.S. were held Sunday to remember those lost in the Sept. 11, 2001 terrorist attacks.
President Barack Obama, right, with Defense Secretary Ash Carter, center, and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford, stand at attention as the national anthem is played during a memorial ceremony at the Pentagon in Washington, Sunday, Sept. 11, 2016, to commemorate the 15th anniversary of the 9/11 terrorist attacks. (AP Photo/Manuel Balce Ceneta)
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