Secretary of Defense Chuck Hagel, front right, and U.S. Army Gen. Martin E. Dempsey, front center, the chairman of the Joint Chiefs of Staff, applaud during a U.S. Transportation Command change of command ceremony at Scott Air Force Base, Ill., May 5, 2014. Hagel welcomed Air Force Gen. Paul J. Selva, the incoming commander of USTRANSCOM, and presided over retirement proceedings for Gen. William M. Fraser III, the outgoing commander, who retired after 40 years of service.