Beverly Herd 17-3: Building Fire
Airman Marcus Gray, 51st Civil Engineer Squadron firefighter, dons his gas mask before responding to a simulated building fire during exercise Beverly Herd 17-3 at Osan Air Base, Republic of Korea September 20, 2017. The exercise was held to evaluate how well base units provided emergency support while defending assets and personnel in a hostile chemical, biological, radiological and nuclear environment. (U.S. Air Force photo by Tech Sgt. Ashley Tyler)