3:335 TSBn

The 3rd Battalion, 335th Regiment (Training Support Battalion), commonly referred to as 3/335 TSBn, is a unit within the U.S. Army Reserve. Its primary mission is to provide Observer, Coach, and Trainer (OC/T) support to Reserve and National Guard units, ensuring their readiness for deployment. The battalion falls under the 181st Infantry Brigade, First Army Division West, and is headquartered at Fort McCoy, Wisconsin. With a lineage dating back to the 335th Infantry Regiment of World War I, 3/335 TSBn continues its legacy by enhancing the combat effectiveness of America’s reserve forces through rigorous training and evaluation.