TINKER AIR FORCE BASE, Okla. -- Four 138th Fighter Wing F-16 Fighting Falcons from Tulsa Air National Guard Base, Oklahoma, refuel from a KC-135R Stratotanker April 25, 2019. The Stratotanker, from the 507th Air Refueling Wing at Tinker Air Force Base, Oklahoma, refueled four 138th Fighter Wing F-16 Fighting Falcons during flight operations over Kansas.