Michael McCartney 316th Civil Engineer Squadron firefighter instructs firefighters to extinguish a simulated fire with water during live fire training in the live fire training building March 5, 2010, at Joint Base Andrews Md. Regular live fire trainings let the firefighter gain the skills needed to think critically and clearly and solve problems quickly, under extreme stress during a real structure fire. (U.S. Air Force photo by Airman 1st Class Perry Aston) (Released)