From left foreground, Secretary of Defense Chuck Hagel, U.S. Air Force Gen. William M. Fraser III and Gen. Paul J. Selva stand at attention during a change of command and retirement ceremony for Fraser May 5, 2014, at Scott Air Force Base, Ill. Selva assumed command of U.S. Transportation 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)