U.S. Air Force Gen. William M. Fraser III, center, passes the U.S. Transportation Command colors to Secretary of Defense Chuck Hagel during a change of command and retirement ceremony May 5, 2014, at Scott Air Force Base, Ill. Gen. Paul J. Selva, right, assumed command from Fraser, who retired from the Air Force after 40 years of service. (DoD photo by Mass Communication Specialist 1st Class Daniel Hinton, U.S. Navy/Released)