104th Infantry (U.S. Army) Description: The 104th Infantry is a unit within the United States Army, specifically designated as an infantry regiment. This regiment has seen active service in various conflicts throughout its history, including World War I and World War II. The 104th Infantry was formed during the reorganization of the National Guard after the Spanish-American War and consists of multiple battalions spread across different states. Its primary role is to engage the enemy by means of fire and maneuver in combined arms operations, as well as conducting stability, security, overwatch, and presence operations when directed. The unit's lineage can be traced back to a number of militia units dating back to the American Revolutionary War.