KC-135 Stratotanker aviators Capts. Chad Metiva and Bryan Generaux from the Michigan Air National Guard’s 171st Air Refueling Squadron, maneuver their KC-135 Stratotanker into an air refueling track during a training mission near the Powder River Training Complex at Ellsworth Air Force Base, S.D., April 1, 2016. Training missions enable aircrews to hone their skills, and prepare them for current and future operations. (U.S. Air Force photo by Senior Airman Rebecca Imwalle/Released)