MINOT AIR FORCE BASE, N.D. --   Members of the 69th Bomb Squadron practice for Air Force Global Strike Challenge in the weapons system trainer at Minot Air Force Base, N.D., Sept. 8, 2015. Global Strike Challenge is the world's premier bomber, intercontinental ballistic missile, helicopter and security forces competition. It is a head-to-head competition across Air Force Global Strike Command's bomber and missile wings. The WST offers the most realistic method available for training and evaluating B-52H Stratofortress crew members. (U.S. Air Force photos/Senior Airman Stephanie Morris)