A 9th Bomb Squadron B-1B Lancer aircrew member, left, and Senior Airman Robert Shedd, 7th Aircraft Maintenance Squadron B-1B Lancer crew chief, review a flight manual before take-off during Exercise Constant Vigilance 16, April 10, 2016, at Dyess Air Force Base, Texas. Air Force Global Strike Command conducts exercises on a regular basis to ensure forces are ready to perform nuclear deterrence operations and deliver long-range strike capabilities at any given moment. (U.S. Air Force photo by Airman 1st Class Katherine Miller/Released)