Secretary of Defense Chuck Hagel, center left, thanks U.S. Air Force Gen. William M. Fraser III, the outgoing commander of U.S. Transportation Command, after presenting him with a Defense Distinguished Service Medal during a USTRANSCOM change of command ceremony at Scott Air Force Base, Ill., May 5, 2014. Hagel welcomed incoming commander Gen. Paul Selva and presided over retirement proceedings for Fraser, who retired after 40 years of service.