KC-135 refuels B-52
U.S. Air Force Maj. Dominique Willis, Deputy Chief of 6th Operations Group Standardization and Evaluation, inspects a KC-135 Stratotanker engine during a pre-flight check at MacDill Air Force Base, Fla., Aug. 21, 2019. Engines are inspected for any abnormalities prior to being started. (U.S. Air Force photo by Senior Airman Frank Rohrig)