Airman 1st Class Brooklynne McGehee, 25th Aircraft Maintenance Unit crew chief, dawns on her gas mask in a simulated chemical attack during Exercise Beverly Bulldog 15-01 Dec. 8, 2014, at Osan Air Base, Republic of Korea. The exercise focuses on readiness, testing Osan’s wartime procedures and realistically looking at our ability to defend the base, execute operations and receive follow-on forces. (U.S. Air Force photo by Senior Airman David Owsianka)