Master Sgt. Jason Keller, 633rd Civil Engineer Squadron assistant training manager, debriefs 633rd CES firefighters after a live-fire exercise March 13, 2013, at Langley Air Force Base, Va. Keller was in charge of overseeing the entire exercise and evaluating the effectiveness of the firefighters. (U.S. Air Force Photo by Airman 1st Class Austin Harvill/Released)