51st CES firefighters prepare for the heat

Osan Air Base, Republic of Korea -- U.S. Air Force Master Sgt. Darnell Walls, 51st Civil Engineer Squadron assistant chief of training, instructs firefighters during a training scenario at Camp Humphreys, Republic of Korea, Sept. 28, 2016. The scenario was a biannual structural firefighting training designed to train in building fires. (U.S. Air Force photo by Staff Sgt. Jonathan Steffen)