Firefighters battle simulated fire
Staff Sgt. Trevor Alexis, a 374th Civil Engineer Squadron fire protection NCO in charge of training, waits to enter a flashover trainer Aug. 4, 2015, at Yokota Air Base, Japan. Flashover, a near-simultaneous ignition of many objects in a confined room, creates a dangerous situation where both heat and smoke continue to increase until combustion. Simulating a flashover fire in a confined room with limited ventilation, enables a trainer to educate and prepare firefighters to recognize and react to a potentially dangerous situation. (U.S. Air Force photo/Airman 1st Class Delano Scott)