Maj. Gen. Christopher P. Azzano (left), outgoing Air Force Test Center commander, thanks Gen. Arnold W. Bunch, Jr., Air Force Materiel Command commander, for his leadership and mentorship during the AFTC Change of Command ceremony at Edwards Air Force Base, Calif., July. 15, 2021. During the ceremony Maj. Gen. Evan C. Dertien assumed command of the AFTC. (U.S. Air Force Photo/Tech. Sgt. Robert Cloys)