U. S Air Force Staff Sgt. Chris Rundell, Heating Ventilation and Air Conditioning craftsman assigned to the 633rd Civil Engineer Squadron, grabs a crescent wrench at Langley Air Force Base, Va., Jan. 5, 2016. Rundell used the wrench to remove bolts from a boiler during an inspection. (U.S. Air Force by Staff Sgt. J.D. Strong II)