B-52H Stratofortresses taxi on the runway during Exercise Constant Vigilance at Minot Air Force Base, N.D., April 17, 2016. Air Force Global Strike Command conducts training operations and exercises on a regular basis to ensure our forces are ready to perform nuclear deterrence operations and long-range strike missions if and when called upon to do so. (U.S. Air Force photo/Airman 1st Class J.T. Armstrong)