A U.S. Air Force KC-135 Stratotanker crew chief, assigned to the 350th Expeditionary Air Refueling Squadron, listens to a pre-flight brief aboard the aircraft at Al Udeid Air Base, Qatar, on Feb. 2, 2021. The KC-135 delivers U.S. Air Forces Central an air refueling capability to enable global reach for joint and coalition aircraft throughout the U.S. Central Command area of responsibility. (U.S. Air Force photo by Staff Sgt. Trevor T. McBride)