CMAFS Fire Training
CHEYENNE MOUNTAIN AIR FORCE STATION, Colo. – Firefighters with the 721st Civil Engineer Squadron evaluate how different amounts of oxygen affect how smoke and fire spread during flash over fire training at the base training area, Aug. 18, 2015. This type of training helps them prepare for flash over fires in real world situations. (U.S. Air Force photo by Airman 1st Class Rose Gudex)