The 108th Cavalry Regiment was constituted in the National Guard on 1 June 1921, allotted to the states of Georgia and Louisiana, and assigned to the 22nd Cavalry Division. It was organized from new and existing units. The 1st Squadron was organized on 6 March 1922 at Atlanta, Georgia, the 2nd Squadron was organized on 21 June 1922 at Jennings, Louisiana. The regimental headquarters was organized on 10 November 1923 and federally recognized at New Orleans, Louisiana. The regiment was relieved from the 22nd Cavalry Division on 19 February 1927 and assigned to the 23rd Cavalry Division. The regiment was reorganized on 15 March 1929 as a three-squadron regiment, with a new 3rd Squadron organized at New Orleans. The Headquarters was withdrawn from the state of Louisiana on 29 June 1936, allotted to the state of Georgia, and organized at Hinesville, Georgia. The regiment, less the Georgia elements, was called up to perform relief and guard duties associated with the flooding of the Mississippi River from 26 April to 19 June 1927. It conducted summer training most years at Fort Oglethorpe, Georgia, from 1921 to 1939, and at Camp McClellan, Alabama, in 1924, 1926–28, and 1933. The designated mobilization training station was Fort Oglethorpe. The 108th Cavalry Regiment was relieved from the 23rd Cavalry Division on 1 October 1940 and disbanded. Regimental elements used to form the 101st and 105th Separate Battalions, Coast Artillery (Antiaircraft).
reorganized and federally recognized 2 August 1921 as Troop B, 1st Louisiana Cavalry
redesignated 24 April 1922 as Troop B 108th Cavalry), redesignated Troop F, 10 August 1922
Troop C, 108th Cavalry at Franklinton, Louisiana (organized and federally recognized 17 December 1921), redesignated Troop G, 21 June 1922. Reorganized 15 March 1929 as a three-squadron regiment with elements at locations as follows:
Regimental Headquarters reorganized at Hinesville, Georgia.
1st Squadron reorganized with Headquarters and Troop B at Hinesville and Troop A at Savannah, Georgia.
2nd Squadron reorganized with Headquarters and Troop E at Bogalusa and Troop F at Franklinton, Louisiana.
3rd Squadron organized and federally recognized 15 March 1929 with Headquarters and Troop I at New Orleans and Troop K at Jennings, Louisiana.
Relieved from the 23rd Cavalry Division (United States) and broken up in October 1940 with elements consolidated, converted and redesignated as follows:
Headquarters Troop at New Orleans redesignated 6 October 1940 as Headquarters Battery, 105th Separate Battalion, Coast Artillery Antiaircraft).
Machine Gun Troop at Atlanta redesignated 12 October 1940 as Battery C, 101st Separate Battalion, Coast Artillery (Antiaircraft).
Headquarters, First Squadron at Hinesville redesignated 12 October 1940 as Headquarters, 101st Separate Battalion, Coast Artillery (Antiaircraft).
Troop A at Savannah redesignated 12 October 1940 as Battery A, 101st Separate Battalion, Coast Artillery (Antiaircraft).
Troop B at Hinesville redesignated 12 October 1940 as Battery B, 101st Separate Battalion, Coast Artillery (Antiaircraft).
Headquarters, 2d Squadron at New Orleans consolidated with Headquarters, 23d Cavalry Division (organized and federally recognized 18 October 1939) and Headquarters, 55th Cavalry Brigade (organized and federally recognized 20 May 1936), reorganized and redesignated 6 October 1940 as Headquarters, 105th Separate Battalion, Coast Artillery (Antiaircraft).
Troop E at Bogalusa redesignated 6 October 1940 as Battery C, 105th Separate Battalion, Coast Artillery (Antiaircraft).
Troop F at Franklinton redesignated 6 October 1940 as Battery D, 105th Separate Battalion, Coast Artillery (Antiaircraft).
Headquarters, 3d Squadron at New Orleans consolidated 6 October 1940 with Headquarters, 105th Separate Battalion, Coast Artillery (Antiaircraft).
Troop I at New Orleans redesignated 6 October 1940 as Battery A, 105th Separate Battalion, Coast Artillery (Antiaircraft).
Troop K at Jennings redesignated 6 October 1940 as Antitank Company, 156th Infantry
Medical Department Detachment at New Orleans reorganized 12 October 1940 to form Medical Department Detachments, 101st and 105th Separate Battalions, Coast Artillery (Antiaircraft).
2nd Squadron Reconnaissance Surveillance and Target Acquisition (RSTA), 108th Cavalry Regiment (LA ARNG) was mobilized on 5 January 2010 for deployment as part of the 256th IBCT.
The 3rd Squadron, 108th Cavalry Regiment was the reconnaissance and surveillance element of the 560thBattlefield Surveillance Brigade, Georgia Army National Guard. Note: The R&S Cavalry Squadron of a battlefield surveillance brigade is organized differently than an RSTA Cavalry Squadron of a brigade combat team. 3–108th Cavalry (R&S) was last headquartered in Atlanta, Georgia. Personnel from this Squadron were transitioned to reconstitute the 3rd Battalion, 121st Infantry Regiment in 2016 shifting headquarters to Cumming Regional Readiness Center. Notably, Troop C (LRS) which was formed from the personnel and equipment of Company H (LRS), 121st Infantry, was not perpetuated, removing the last "Airborne" designated unit from the Georgia Army National Guard.
The 3rd Squadron, 108th Cavalry Regiment was inactivated in a ceremony on 5 March 2016 at the Atlanta Readiness Center, with personnel being used to form the 3d Battalion, 121st Infantry Regiment, 48th BCT.[1]