(Left) Staff Sgt. Raymond Granillo, 28th Civil Engineer Squadron fire protection crew chief, holds a bucket of flammable liquid used to ignite training fires while Staff Sgt. Chris Voth, 114th Air National Guard Civil Engineer Squadron fire protection crew chief, turns his propane tank off here, May 13.The pit fire exercise helps satisfy certification requirements for firecrews. (U.S. Air Force photo/Airman 1st Class Adam Grant)