The 126th Air Refueling Squadron (126 ARS) is a unit of the Wisconsin Air National Guard 128th Air Refueling Wing located at General Mitchell Air National Guard Base, Wisconsin. The 126th is equipped with the KC-135R Stratotanker. The squadron is a descendant organization of the Wisconsin National Guard 126th Observation Squadron, established on 30 July 1940. It is one of the 29 original National Guard Observation Squadrons of the United States Army National Guard formed before World War II.