President Barack Obama, flanked by Defense Defense Leon Panetta, left, and Joint Chiefs Chairman Gen. Martin Dempsey, place their hands over their hearts at the Pentagon Memorial,Tuesday, Sept. 11, 2012, during a ceremony to mark the 11th anniversary of the Sept. 11 attacks. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama, flanked by Defense Defense Leon Panetta, left, and Joint Chiefs Chairman Gen. Martin Dempsey, place their hands over their hearts at the Pentagon Memorial,Tuesday, Sept. 11, 2012, during a ceremony to mark the 11th anniversary of the Sept. 11 attacks. (AP Photo/Carolyn Kaster)
President Barack Obama, flanked by Defense Defense Leon Panetta, left, and Joint Chiefs Chairman Gen. Martin Dempsey, place their hands over their hearts at the Pentagon Memorial,Tuesday, Sept. 11, 2012, during a ceremony to mark the 11th anniversary of the Sept. 11 attacks. (AP Photo/Carolyn Kaster)
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