U.S. Airmen assigned to the 123rd Airlift Wing, Kentucky National Guard practice refueling operations in an austere environment, transferring fuel directly from one aircraft to another at Lechfeld Air Base, Germany, during exercise Air Defender (AD23), June 19, 2023. Exercise AD23 integrates both U.S. and allied air-power to defend shared values, while leveraging and strengthening vital partnerships to deter aggression around the world. (U.S. Air National Guard photo by Staff Sgt. Joseph R. Morgan)