Staff Sgt. Sean Douglas
U.S. Air Force Staff Sgt. Sean Douglas, 51st Civil Engineer Squadron firefighter, simulates injecting an epinephrine auto-injector pen into a patient during Exercise Beverly Herd 17-1 at Osan Air Base, Republic of Korea, Feb. 28, 2017. Medical and civil engineer personnel tested how well first-responders could treat and evacuate decontaminated victims during a real-world chemical attack.
(U.S. Air Force photo by Tech. Sgt. Ashley Tyler)