The 153d Air Refueling Squadron (153 ARS) is a unit of the Mississippi Air National Guard 186th Air Refueling Wing located at Key Field Air National Guard Base, Mississippi. The 153d is equipped with the KC-135 Stratotanker aircraft. The squadron is a descendant organization of the 153d Observation Squadron, one of the 29 original National Guard Observation Squadrons of the United States Army National Guard formed before World War II.