April 12, 2023 Republic of Korea Air Force visit to AFTC HQ U.S. Air Force Maj. Gen. Evan Dertien, Air Force Test Center commander, briefs members of the Republic of Korea Air Force on test at Edwards Air Force Base, Calif., Apr. 21, 2023. The ROKAF visited AFTC HQ to learn new weapon system test and evaluation methods. (U.S. Air Force photo by Tech. Sgt.