The 87th Infantry Regiment is an infantry regiment in the United States Army. The regiment's 1st and 2nd Battalions are light infantry units assigned to the 1st and 2nd Brigade Combat Teams respectively of the 10th Mountain Division located at Fort Drum, New York. The 3d Battalion was active in the U.S. Army Reserve in Colorado. The 4th Battalion was a Regular Army unit assigned to the 3rd Brigade Combat Team of the 25th Infantry Division (Light) at Schofield Barracks, Hawaii.