Sergeant Stubby was a dog and the unofficial mascot of the 102nd Infantry Regiment and was assigned to the 26th (Yankee) Division in World War I. He served for 18 months and participated in 17 battles and four offensives on the Western Front. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and allegedly once caught a German soldier by the seat of his pants, holding him there until American soldiers found him. His actions were well-documented in contemporary American newspapers.

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.