U.S. Navy Vice Adm. Andy Brown, foreground left, the deputy commander of U.S. Transportation Command, salutes as Secretary of Defense Chuck Hagel disembarks from an aircraft at Scott Air Force Base, Ill., May 5, 2014, to attend a USTRANSCOM change of command ceremony. Hagel welcomed U.S. Air Force Gen. Paul J. Selva, the incoming commander of USTRANSCOM, to the post during the ceremony and presided over retirement proceedings for outgoing commander Gen. William M. Fraser III, who retired after 40 years of service.