Four U.S. Air Force F-22 Raptors and a KC-135 Stratotanker, assigned to the 434th Air Refueling Wing, Grissom Air Reserve Base, Ind., conduct aerial refueling over the continental United States, Aug. 21, 2018, during the Northern Lightning 18-2 exercise. Northern Lightning is one of seven Air National Guard joint accredited exercises held at a Combat Readiness Training Center and provides tailored, cost-effective and realistic combat training for participating units in a joint and multinational environment.
U.S. Air National Guard photo by Tech. Sgt. Mary E. Greenwood