A group of 940th Air Refueling Wing pilots and crew chiefs go through a preflight checklist Jan. 17, 2019, at Beale Air Force Base, Calif. The 940th Aircraft Maintenance Squadron crew chiefs are responsible for inspecting, maintaining and launching the entire KC-135 Stratotanker fleet on base. (U.S. Air Force photo by Senior Airman Tristan D. Viglianco)
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