415th Infantry Regiment (United States)  The 415th Regiment is a regiment of the United States Army Reserve. Established 24 June 1921 as the 415th Infantry, part of the Organized Reserves, it was attached to the 104th Infantry Division. The regiment was originally headquartered in Casper, Wyoming. Ordered into active service on 15 September 1942, the regiment saw service during World War II with campaign participation credit in Northern France, Rhineland, and Central Europe. Inactivated during post-World War II demobilization, the regiment was reactivated 12 June 1947 as part of the Organized Reserves and headquartered in Tacoma, Washington under the 104th Division. The Battalions have been realigned under the 95th Training Division and provides trained personnel to support Initial Entry Training. Most recently, the regiment has served in support of the Global War on Terror.