The Oregon Air National Guard origins date to 30 July 1940 with the establishment of the 123rd Observation Squadron and is oldest unit of the Oregon 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 unit consisted of two officers, 108 enlisted men and two aircraft, a North American BC-1A (like the AT-6) and a Douglas O-46A. The squadron flew observation missions primarily along the Pacific Coast and occasionally made mail flights. The 123rd Observation Squadron was ordered into active service on 15 September 1941 as part of the buildup of the Army Air Corps prior to the United States entry into World War II.