U.S. Air Force Staff Sgt. Robert Gallagher, 7th Aircraft Maintenance Squadron crew chief, raises the step ladder on a B-1B Lancer during Exercise Constant Vigilance 16, April 10, 2016, at Dyess Air Force Base, Texas. Constant Vigilance 16 involved both command and control elements and operations units throughout Air Force Global Strike Command, designed to exercise the command’s ability to support its conventional and nuclear missions. (U.S. Air Force photo by Airman 1st Class Rebecca Van Syoc/Released)