U.S. Air Force Staff Sgt. Patrick Bentley and Senior Airman Wesley Martin, 20th Civil Engineer Squadron firefighters, train with compressed air foam on a fixed structure at Shaw Air Force Base, S.C., March 10, 2014. 20th CES airmen familiarized themselves with the new CAF a mixture of foam, water and air which cools the temperature of a structure down while also distinguishing flames. (U.S. Air Force photo by Airman 1st Class Jensen Stidham/Released)