President Barack Obama, second from right, Defense Secretary Ash Carter, second from left, and Marine Gen. Joseph F. Dunford Jr, left, the incoming chairman of the Joint Chiefs of Staff, render honors during the change-of-responsibility ceremony between Dunford and Army Gen. Martin E. Dempsey, the outgoing chairman, on Joint Base Myer-Henderson Hall in Arlington, Va., Sept. 25, 2015. DoD photo by U.S. Army Sgt. 1st Class Clydell Kinchen