Airmen from the Royal Australian Air Force reinstall a cover door of a C-17 Globemaster III aircraft trainer auxiliary power unit April 19, 2016, at Joint Base Lewis-McChord, Wash. Because of McChord Fields advanced state of the art aircraft training facilities, the Royal Australian Air Force is one of the many foreign militaries that are trained at JBLM on C-17 maintenance. (U.S. Air Force photo/Senior Airman Jacob Jimenez)