Secretary of Defense Chuck Hagel, center, is saluted by U.S. Sailors as he departs from 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, to the post and presided over retirement proceedings for outgoing commander Gen. William M. Fraser III, who retired after 40 years of service.