The Indiana Air National Guard origins date to 1 August 1921 with the establishment of the 137th Squadron (Observation) in the Indiana NG, which had activated at Fagley Field, being equipped with Curtiss JN-4 Jennies. It was re-designated the 113th Observation Squadron on 25 January 1923, the unit relocated to Schoen Field and then Stout Field (formerly Mars Hill), Indianapolis in October 1926 and is oldest unit of the Indiana Air National Guard. It is one of the 29 original National Guard Observation Squadrons of the United States Army National Guard formed before World War II. The 113th Observation Squadron was ordered into active service on 1 September 1941 as part of the buildup of the Army Air Corps prior to the United States entry into World War II.
