OSAN AIR BASE, Republic of Korea -- U.S. Airmen respond to a simulated bomb threat scenario during the Mustang Rodeo exercise at Osan Air Base, Republic of Korea, May 11, 2026. The exercise involved the 51st Security Forces Squadron and the 51st Civil Engineer Squadron responding to a simulated threat at the base post office to evaluate emergency response coordination and installation readiness. (U.S. Air Force photos by Senior Airman Rome Bowermaster)