U.S. Air Force Senior Airman Robert Powell, 7th Aircraft Maintenance Squadron crew chief, left, and Tech. Sgt. Ross Perry, 7th AMXS electronic warfare noncommissioned officer in charge, replace the power control assembly on a B-1B Lancer April 9, 2016, at Dyess Air Force Base, Texas. Perry and Powell participated in Exercise Constant Vigilance 16, an annual exercise conducted by Air Force Global Strike Command that includes simultaneous elements that test and refine the command’s policies, training and techniques at the tactical and operational levels. (U.S. Air Force photo by Senior Airman Shannon Hall/Released)