Posted: 10/25/2021
Three F-15C Eagles and an F-15EX Eagle II fly behind a KC-135 Stratotanker during an in-air refueling mission over Tinker Air Force Base, Okla., Oct. 15, 2021. In-air refueling allows fighter aircraft to stay airborne for extended periods without having to land to refuel. (U.S. Air Force photo by 2nd Lt. Mary Begy)
