MEMORIAL MOMENT U.S. Defense Secretary Ash Carter, second from right, attends a wreath-laying ceremony with, left to right, Afghan Chief Executive Abdullah Abdullah, President Ashraf Ghani and U.S. Vice President Joe Biden at the Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington, Va., March 24, 2015. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 375348-T-XAX97-377.jpg Photo Gallery