Esther Robinson sings the national anthem at the start of the Air Force Test Center Change of Command ceremony held July 15, 2021, in Hangar 1600 at Edwards Air Force Base, Calif. During the ceremony Maj. Gen. Evan C. Dertien assumed command of the Air Force Test Center from Maj. Gen. Christopher P. Azzano. (U.S. Air Force Photo/Tech. Sgt. Robert Cloys)