List of observation squadrons of the United States Army National Guard

United States Army National Guard units began forming Aerial Observation units before World War I. When the United States entered the war in April 1917, about 100 National Guard pilots joined the newly-formed United States Army Air Service.

After the demobilization of the World War I Air Service in 1919, in 1920, the Militia Bureau and the Air Service agreed on forming postwar National Guard aviation units. On 17 January 1921 the 109th Observation Squadron of the Minnesota National Guard became the first postwar air unit to receive federal recognition. They flew a wide variety of aircraft during the inter-war period. These included the Curtiss JN-4 "Jenny" , Consolidated PT-1 "Trusty", Consolidated PT-3, Northrop BT-1, Douglas O-2 and Consolidated O-17 Courier during 1923-1931; the Douglas O-38 during 1931-1935; and the Douglas O-43 and North American O-47 between 1935 and 1942.

These 29 squadrons formed by the Army before World War II remain active Air National Guard units today and are the direct predecessors of today's current units.

Unit	State	Organized	Federal Recognition*	Federalized / Inactivated	Comments
101st Observation Squadron	Massachusetts	22 August 1917	25 January 1923	25 November 1940	Initially World War I 101st Aero Squadron. Deployed to France, was aircraft maintenance unit. demobilized 1919; Re-formed 1923, 26th Division, MA National Guard. Ordered to active service on 25 Nov 1940; allotted to ANG, on 29 Jul 1946; now 101st Intelligence Squadron.
102d Observation Squadron	New York	23 August 1917	17 November 1921	15 October 1940	Initially World War I 102d Aero Squadron. Deployed to France, was primarily a transportation and aircraft maintenance unit. demobilized 1919; Re-formed 1921, 27th Division, NY National Guard. Ordered to active service on 15 Oct 1940; allotted to ANG, on 24 May 1946; now 102d Reconnaissance Squadron.
103d Observation Squadron	Pennsylvania	27 June 1924	27 June 1924	17 February 1941	28th Division, PA National Guard. Ordered to active service on 17 Feb 1941; allotted to ANG, on 24 May 1946; now 103d Fighter Squadron
104th Observation Squadron	Maryland	29 June 1921	29 June 1921	3 February 1941	29th Division, MD National Guard. Ordered to active service on 3 Feb 1941; allotted to ANG, on 24 May 1946; now 104th Fighter Squadron
107th Observation Squadron	Michigan	27 August 1917	7 May 1926	15 October 1940	Initially World War I 107th Aero Squadron. Deployed to France, assembled, serviced and repaired aircraft. demobilized 1919; Re-formed 1926, 32d Division, MI National Guard. Ordered to active service on 15 Oct 1940; allotted to ANG, on 24 May 1946; now 107th Fighter Squadron
108th Observation Squadron	Illinois	27 August 1917	1 July 1927	3 February 1941	Initially World War I 108th Aero Squadron. Deployed to France, repaired and maintained aircraft. demobilized 1919; Re-formed 1927, 33d Division, IL National Guard. Ordered to active service on 3 Feb 1941; allotted to ANG, on 24 May 1946; ;now 108th Air Refueling Squadron
109th Observation Squadron	Minnesota	27 August 1917	17 January 1921	10 February 1941	Initially World War I 109th Aero Squadron, deployed to France, primarily a transportation unit on Western Front, demobilized 1919; Re-formed 1921, 34th Division, MN National Guard. Ordered to active service on 10 Feb 1941; allotted to ANG, on 24 May 1946; now 109th Airlift Squadron
110th Observation Squadron	Missouri	14 August 1917	23 June 1923	23 December 1940	Initially World War I 110th Aero Squadron, remained in United States, demobilized 1918; Re-formed 1923, 35th Division, MO National Guard. Ordered to active service on 23 Dec 1940; allotted to ANG, on 24 May 1946; now 110th Bombardment Squadron
111th Observation Squadron	Texas	14 August 1917	29 June 1923	25 December 1940	Initially World War I 111th Aero Squadron, deployed to France, operated as a supply unit, demobilized 1919; Re-formed 1923, 36th Division, TX National Guard. Ordered to active service on 25 Dec 1940; allotted to ANG, on 24 May 1946; now 111th Reconnaissance Squadron
112th Observation Squadron	Ohio	18 August 1917	20 June 1927	25 November 1940	Initially World War I 112th Aero Squadron, remained in United States, demobilized 1919; Re-formed 1927, 37th Division, OH National Guard. Ordered to active service on 25 Nov 1940; allotted to ANG, on 24 May 1946; now 112th Fighter Squadron
113th Observation Squadron	Indiana	26 August 1917	1 August 1921	17 January 1941	Initially World War I 113th Aero Squadron, remained in United States, demobilized 1919; Re-formed 1921, 38th Division, IN National Guard. Ordered to active service on 17 Jan 1941; allotted to ANG, on 24 May 1946; now 113th Air Support Operations Squadron
114th Observation Squadron 106th Observation Squadron	Alabama	27 August 1917	21 January 1922	25 November 1940	Initially World War I 106th Aero Squadron, deployed to France, repaired and maintained aircraft, demobilized 1919; reformed as 114th Observation Squadron; consolidated (1936) with 135th Squadron (organized 21 Jan 1922); served from 1923 with 39th Division to 1924 and thereafter with 31st Division, AL National Guard. Ordered to active service on 25 Nov 1940; re-designated: 100th Bombardment Squadron (Medium) on 9 May 1944; allotted to ANG on 24 May 1946; now 106th Air Refueling Squadron
115th Observation Squadron	California	28 August 1917	16 June 1924	3 March 1941	Initially World War I 115th Aero Squadron. Deployed to France, Constructed facilities and engaged in supply and related base support activities, demobilized 1919; Re-formed 1924, 40th Division, CA National Guard. Ordered to active service on 3 March 1941; allotted to ANG, on 24 May 1946; now 111th Airlift Squadron
116th Observation Squadron	Washington	29 August 1917	6 August 1924	16 September 1940	Initially World War I 116th Aero Squadron, deployed to France. Performed transportation and supply missions on the Western Front, demobilized 1919; Re-formed 1924, 41st Division, WA National Guard. Ordered to active service on 16 September 1940; allotted to ANG, on 24 May 1946; now 116th Air Refueling Squadron.
118th Observation Squadron	Florida				Initially World War I 116th Aero Squadron (demobilized 1919); now CT ANG 118th AS.
119th Observation Squadron	New Jersey				Initially World War I 5th Aviation School Squadron (demobilized 1919); now 119th FS
120th Observation Squadron	Colorado				now 120th FS.
121st Observation Squadron	District of Columbia				now 121st FS.
122d Observation Squadron	Louisiana				now 122d FS.
123d Observation Squadron	Oregon		18 April 1941	15 September 1941	Ordered to active service during World War II; allotted to ANG on 24 May 1946; now 123d FS.
124th Observation Squadron	Iowa				now 124th FS.
125th Observation Squadron	Oklahoma				now 125th FS.
126th Observation Squadron	Wisconsin		12 November 1940	18 October 1942	Inactivated; re-activated and re-designated 34th Photographic Reconnaissance Squadron on 11 Aug 1943; allotted to ANG on 24 May 1946; now 126th ARS.
127th Observation Squadron	Kansas				now 127th CCS.
128th Observation Squadron	Georgia				Initially World War I 840th Aero Squadron (demobilized 1919); now 128th ACCS
136th Observation Squadron 105th Observation Squadron	Tennessee	27 August 1917	4 December 1921	18 October 1942	Initially World War I 105th Aero Squadron (demobilized 1919); reformed as 105th Observation Squadron; consolidated (1936) with 136th Squadron (organized 4 Dec 1921); Inactivated on 18 October 1942; Re-activated on 1 March 1943 as 105th Reconnaissance Squadron (Bombardment); allotted to ANG on 24 May 1946; now 105th AS.
152d Observation Squadron	Rhode Island				now AZ ANG 152d FS.
153d Observation Squadron	Mississippi				now 153d ARS
154th Observation Squadron	Arkansas				Initially World War I 154th Aero Squadron (demobilized 1919); now 154th TS.

* Note: The "Federal Recognition" date is the effective date the unit was recognized for National Guard Service. Demobilized World War I Air Service units were re-established and re-designated effective that date.

See also

• Air National Guard

References

 This article incorporates public domain material from the Air Force Historical Research Agency

• Rosenfeld, Susan and Gross, Charles J (2007), Air National Guard at 60: A History. Air National Guard history program AFD-080527-040
• Mauer, Mauer (1969), Combat Squadrons of the Air Force, World War II, Air Force Historical Studies Office, Maxwell AFB, Alabama. ISBN 0892010975
• Individual unit histories of above listed units