U.S. Air Force flying crew chiefs assigned to the 660th Aircraft Maintenance Squadron, prepare KC-10 Extender aircraft prior to takeoff July 11, 2019, at Travis Air Force Base, California. FCCs are responsible for a wide variety of maintenance duties while traveling with the aircraft to including refueling, paperwork, routine maintenance and troubleshooting major issues. (U.S. Air Force photo by Heide Couch)
28.0-300.0 mm f/3.5-5.6
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