The 102nd Infantry Regiment currently consists of one battalion in the Connecticut National Guard. In the modern U.S. Army regimental system, regimental designation is used only in historical tradition, and there is no regimental headquarters or staff. It is one of several National Guard units with colonial roots. The 1st Battalion, 102nd Regiment is headquartered in New Haven, Connecticut. Its mascot is Sergeant Stubby.

The Connecticut Military Department is a state agency of the government of Connecticut. Its primary components are the Connecticut Army National Guard, the Connecticut Air National Guard, and four companies of the state militia. The Military Department of the State of Connecticut traces its origins to May 11, 1637, when the "General Courts" established a military arm of the provincial government. In 1939, the State's Military Department was established to consolidate the offices of Adjutant General, Quartermaster General, Armory Board, and Armory Board Inspector.