Outgoing Deputy Secretary of Defense Ash Carter, center, and his wife, Stephanie, listen on the Pentagon Auditorium stage as a U.S. Army musical unit delivers a tribute to him during a farewell ceremony at the Pentagon in Arlington, Va., Dec. 2, 2013. Joining them on stage were Secretary of Defense Chuck Hagel, left, and U.S. Army Gen. Martin E. Dempsey, the chairman of the Joint Chiefs of Staff.