A 9th Bomb Squadron B-1B Lancer weapons system officer prepares to enter an aircraft prior to take off during Exercise Constant Vigilance 16, April 10, 2016, at Dyess Air Force Base, Texas. CV16 involves both command and control elements and operational units throughout Air Force Global Strike Command, designed to exercise the command’s ability to support its conventional and nuclear missions. (U.S. Air Force photo by Airman 1st Class Katherine Miller/Released)