904th Expeditionary Air Refueling Squadron
The 904th Expeditionary Air Refueling Squadron is an inactive United States Air Force unit. It was last assigned to the 320th Bombardment Wing at Mather Air Force Base, California, where it was inactivated on 30 September 1986.
Source: Wikipedia — 904th Expeditionary Air Refueling Squadron (CC BY-SA 4.0)