Airman Braydon Campbell, 372nd Training Squadron Detachment 21 crew chief student, signals a U-2 Dragon Lady while Staff Sgt. Joseph Tapia-Rubio, 372nd TRS Det. 21 U-2 crew chief instructor, supervises Aug. 8, 2019, at Beale Air Force Base, California. Future U-2 maintainers complete their technical school training at Det. 21. (U.S. Air Force photo by Senior Airman Tristan D. Viglianco)