A NATO AWACS, assigned to the NATO Airborne Early Warning & Control Force, and a KC-135 Stratotanker, assigned to the 121st Air Refueling Wing, Rickenbacker Air National Guard Base, Ohio, prepare to conduct air refueling operations over Europe, May 17, 2023. NATO Air Base Geilenkirchen hosts air refueling units from around the United States to perform air-to-air refueling for the NATO Airborne Warning and Control System aircraft. (NATO photo by U.S. Air Force Staff Sgt. Andrew D. Sarver)