List of observation squadrons of the United States Army National Guard
On 17 January 1921 the 109th Observation Squadron of the Minnesota National Guard became the first postwar air unit to receive federal recognition.[1][2] All 29 squadrons (18 of them having lineages dating back to World War I) remain active Air National Guard units today.As part of the Army Air Corps, the units were transformed from observation organizations into reconnaissance, liaison, fighter, and bombardment squadrons.The most significant wartime contribution of National Guard aviators was to train and lead the large numbers of volunteer airmen who had entered the AAF.[1][3][32] This article incorporates public domain material from the Air Force Historical Research Agency