U.S. Air Force Staff Sgt. Kyle Gregory, 633rd Civil Engineer Squadron lead firefighter, prepares a fire for a training exercise at Joint Base Langley-Eustis, Virginia, Sept. 20, 2018. The burn pit at Langley Air Force Base, Virginia, is equipped with trainers for firefighters to practice response scenarios for buildings, and large and small aircraft. (U.S. Air Force photo by Staff Sgt. Areca T. Bell)