U.S. Army Gen. Martin E. Dempsey, second from right, the chairman of the Joint Chiefs of Staff, talks with fellow U.S. Service members while visiting Kabul, Afghanistan, Aug. 25, 2014, to attend a change of command ceremony for the International Security Assistance Force and U.S. Forces-Afghanistan. U.S. Marine Corps Gen. Joseph F. Dunford Jr. formally relinquished command to U.S. Army Gen. John F. Campbell during the event.