A U.S. Air Force C-17 Globemaster III from the 301st Airlift Squadron, 349th Air Mobility Wing, Travis Air Force Base, Calif., is refueled by a KC-10 Extender, July 20, 2017.
The C-17 Globemaster III was conducting a local training mission in Northern Calif. (U.S. Air Force photo Louis Briscese) Original public domain image from Flickr