A 51st Fighter Wing Security Forces airmen secure the access point to the Air Base's main water filtration facility during an Operational Readiness Exercise Beverly Midnight 11-01 at Osan Air Base, Republic of Korea, Feb. 17. The exercise allows airmen to demonstrate their ability to complete the mission in simulated chemical environments while executing their primary duties, practicing self aid and buddy care, conduction post-attack reconnaissance and unexploded ordnance sweeps.