The 102nd Infantry Regiment currently consists of one battalion in the Connecticut National Guard. Regimental designation is used only in historical tradition. There is no regimental commander, staff or headquarters. The 1st Battalion, 102nd Regiment is headquartered in New Haven, Connecticut.
In August 1917, the Regiment was organized with 3,755 Officers and enlisted men:Headquarters & Headquarters Company- 303
Supply Company- 140
Machine Gun Company- 178
Medical & Chaplain Detachment- 56
Infantry Battalion (x3)- 1,026
Rifle Company (x4)- 256
After completing its war service in France with the 26th Division, the Regiment arrived at the port of Boston on 7 April 1919 on the U.S.S. Agamemnon and demobilized at Camp Devens, Massachusetts on 29 April 1919.
Reconstituted in the National Guard in 1921 as the 170th Infantry, assigned to the 43d Infantry Division, and allotted to the state of Connecticut. Reorganized 20 October 1922 by withdrawal of the 2d Infantry Regiment, Connecticut National Guard, from the 169th Infantry Regiment (organized 23 May 1921 by consolidation and redesignation of the 1st and 2d Infantry Regiments as the Connecticut Regiment of Infantry; redesignated 169th Inf. on 7 October 1921) and redesignation of the 2d Infantry as the 170th Infantry. Regimental Headquarters organized 8 June 1923 and federally recognized at New Haven, Connecticut.
The 170th Infantry was redesignated as the 102d Infantry on 28 February 1924. The regiment, or elements thereof, were called up to perform the following state duties: riot control at the textile workers strike at Putnam, in September 1934; flood relief at Hartford from 19 March–1 April 1936; hurricane relief in the vicinity of Rockville from 22–27 September 1938. The Regiment conducted annual summer training most years at Niantic between 1921–38. Inducted into active Federal service at New Haven on 24 February 1941 and moved to Camp Blanding, Florida, where it arrived 15 March 1941.
In July 1943, the Regiment was organized with 3,256 Officers and enlisted men:Headquarters & Headquarters Company- 111
Service Company- 114
Anti-Tank Company- 165
Cannon Company- 118
Medical Detachment- 135
Infantry Battalion (x3)- 871
Headquarters & Headquarters Company- 126
Rifle Company (x3)- 193
Weapons Company- 156
The 1948 organization of the Regiment TOE 29-7T called for a strength of 3,774 Officers and enlisted men organized as below:Headquarters & Headquarters Company- 289
Service Company- 186
Tank Company- 148
Heavy Mortar Company- 190
Medical Company- 214
Infantry Battalion (x3)
Headquarters & Headquarters Company- 119
Rifle Company (x3)- 211
Weapons Company- 165
In 2006, the 86th Infantry Brigade Combat Team (Mountain) was reorganized from a "heavy" brigade to a specialized light infantry formation. The 1-102nd Infantry was added as the brigade slowly formed from 2006, transitioning to the 42d Infantry Division.
The 86th IBCT mobilized in December 2009 at Camp Atterbury, Indiana and completed a Joint Readiness Training Center rotation at Fort Polk prior to deployment in support of Operation Enduring Freedom. The brigade returned home in December 2010 after being replaced by 2nd IBCT, 34th ID.
As part of the 2020 Army Force Structure Realignment, the 86th IBCT - which includes the 1-102d IN - was moved in 2016 from the 42d ID to the 10th Mountain division and wears their shoulder sleeve insignia.Organized 26 June in the Connecticut Militia as Regiment of New Haven County
Reorganized as the 2nd Regimental Militia on 11 October 1739 from existing companies in the Connecticut Colony
Reorganized in 1816 and again in 1847 without material change
Organized as the 2nd Connecticut Volunteers on 7 May 1861 and mustered out on 7 August 1861
Organized as the 20th Connecticut Volunteers on 8 September 1862 and mustered out 13 June 1865
Reorganized as the 2nd Infantry in 1865
Redesignated as the 102nd Infantry Regiment on 22 August 1917 and assigned to the 26th Infantry Division
Redesignated as the 169th Infantry and assigned to the 43rd Division on 7 October 1921
Reorganized as the 170th Infantry 20 October 1922
Redesignated 102nd Infantry and assigned to the 43rd Division on 28 February 1924
Relieved from the 43rd Infantry Division and consolidated with 963rd Field Artillery Battalion to form 102nd Infantry on 1 May 1959