Senior Airman Luis Perfino and Senior Airman Dane Haugbom, 940th Aircraft Maintenance Squadron crew chiefs, walk a KC-135 Stratotanker pilot through a preflight inspection Jan. 17, 2019, at Beale Air Force Base, Calif. The 940th AMXS crew chiefs are responsible for inspecting, maintaining and launching the entire KC-135 fleet on base. (U.S. Air Force photo by Senior Airman Tristan D. Viglianco)