U.S. Air Force Staff Sgt. Robert Gallagher, 7th Aircraft Maintenance Squadron crew chief, removes the blocks on a B-1B Lancer during Exercise Constant Vigilance 16, April 10, 2016, at Dyess Air Force Base, Texas. The exercise included simultaneous elements that tested and refined Air Force Global Strike Command’s policies, training and techniques at the tactical and operational levels. (U.S. Air Force photo by Airman 1st Class Rebecca Van Syoc/Released)