Senior Airman Travis Burnett, 91st Air Refueling Squadron boom operator trains on MacDill Air Force Base’s new KC-135 Stratotanker Boom Operator Weapon System Trainer, July 12, 2013. The BOWST is a fully-simulated, large-scale procedural trainer for aerial refueling with replicated aircraft systems, controls, and functions within a complete aircrew boom compartment. (U.S. Air Force photo/Staff Sgt. Brandon Shapiro)