Airmen from the 351st Air Refueling Squadron and 100th Aircraft Maintenance Squadron review a checklist prior to a flight at RAF Mildenhall, England, April 23, 2020. The 100th Air Refueling Wing is the only permanent U.S. air refueling wing in the European theater, providing the critical air refueling "bridge" which allows the Expeditionary Air Force to deploy around the globe at a moment's notice. (U.S. Air Force photo by Tech. Sgt. Emerson Nuñez)