TRAVIS AIR FORCE BASE, Calif. -- Master Sgt. Russell Downie, 79th Air Refueling Squadron boom operator, passes jet fuel from his KC-10 Extender to an awaiting C-17 Globemaster III over the coast of northern California on Sept. 26, 2015. Downie refueled the aircraft as part of the 349th Air Mobility Wing's AFSC training day. (U.S. Air Force photo/Airman 1st Class Shelby R. Horn)