Airmen from the 8th Security Forces Squadron conduct perimeter security following a simulated ground attack during Exercise Beverly Midnight 15-4 at Kunsan Air Base, Republic of Korea, July 16, 2015. Combat Airmen reacted, survived and operated in a simulated combat zone to validate and enhance Kunsan’s mission to defend the base and take the fight north during the five-day operational readiness exercise. (U.S. Air Force photo by Senior Airman Katrina Heikkinen/Released)