U.S. Army Gen. Martin E. Dempsey, second from right, the chairman of the Joint Chiefs of Staff, speaks with other participants and attendees of a change of command ceremony for the International Security Assistance Force and U.S. Forces-Afghanistan Aug. 26, 2014, in Kabul, Afghanistan. U.S. Marine Corps Gen. Joseph F. Dunford Jr., center right, formally relinquished command to U.S. Army Gen. John F. Campbell during the event.