U.S. Air Force Staff Sgt. Franklin Sallis, 633rd Civil Engineering Squadron heating and ventilation craftsman, removes a ceiling panel from inside a dormitory kitchen at Langley Air Force Base, Va., Nov. 20, 2014. Sallis was preparing to reprogram the ventilation system’s computer. (U.S. Air Force photo by Airman 1st Class Devin Scott Michaels/Released)