3rd Infantry Regiment Distinctive Unit Insignia
US Army <br> (Vector graphics image by <a href="//commons.wikimedia.org/wiki/User:Lancaster" title="User:Lancaster">Lancaster</a>)
1921-01-10
<a rel="nofollow" class="external text" href="http://www.tioh.hqda.pentagon.mil/">US Army Institute of Heraldry</a>