Crew chiefs from the 509th Aircraft Maintenance Squadron prepare a B-2 Spirit for takeoff during Exercise Global Thunder 17 at Whiteman Air Force Base, Mo., Oct. 27, 2016. GT17 is a training opportunity to exercise all U.S. Strategic Command mission areas and create the conditions for strategic deterrence against a variety of threats. (U.S. Air Force photo by Senior Airman Joel Pfiester)