The 137th Air Refueling Group is an associate unit of the Oklahoma Air National Guard stationed at Tinker Air Force Base, Oklahoma. If activated for federal service, the group is gained by Air Mobility Command. As of July 2015, the group is in the process of returning to Will Rogers Air National Guard Base and converting from the air refueling to the special operations mission. From 1961 until it was inactivated in 1975, the group engaged in strategic and tactical airlift. The group was activated again in 1992 and converted to the air refueling mission in 2008.