U.S. Air Force Airman 1st Class Malachi Greman, a 50th Air Refueling Squadron boom operator, completes pre-flight inspections on a KC-135 Stratotanker at MacDill Air Force Base, Fla., Jan. 30, 2020. Boom operators have aircrew responsibilities extending past their in-air refueling capabilities; they also aid pilots by watching and listening to anything occurring in the aircraft to ensure a safe flight. (U.S. Air Force photo by Airman 1st Class Ryan C. Grossklag)