U.S. Army Gen. Martin E. Dempsey, right, the chairman of the Joint Chiefs of Staff, visits the International Security Assistance Force (ISAF) headquarters in Kabul, Afghanistan, Aug. 26, 2014, to attend a change of command ceremony for ISAF 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.