Company D 1st Battalion 181st Infantry Regiment is a heavy weapons company in the 181st Infantry Regiment. It provides anti-armor and heavy machine gun support to the battalion operations. In the National Guard, companies sometimes have two histories. They share the history of the regiment to which they are assigned, but also may have a unique company history and lineage. Therefore, Company D 1-181 IN shares the long history of the 181st Infantry Regiment (United States). This site concentrates on the unique history of Company D as a militia / National Guard company in Hudson, MA. The company traces its history to 1864 during the Civil War, when it was first mustered as the Company I, 5th Massachusetts Infantry. It later served as a federalized Massachusetts National Guard regiment with th