U.S. Air Force Tech. Sgt. Matthew Smith, 660th Aircraft Maintenance Squadron flying crew chief, visually checks the engine cowling on a KC-10 Extender 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 including refueling, paperwork, routine maintenance and troubleshooting major issues. (U.S. Air Force photo by Heide Couch)
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