Airmen from the 351st Air Refueling Squadron and 100th Aircraft Maintenance Squadron conduct pre-flight checks prior to a flight supporting Exercise Valiant Liberty at RAF Mildenhall, England, March 4, 2020. Valiant Liberty is an agile combat employment exercise being conducted from March 2-13 which includes limited low-level and night flying. (U.S. Air Force photo by Tech. Sgt. Emerson Nuñez)