Shoulder Sleeve Insignia - 3rd Armored Cavalry Regiment - MugThe 3rd Cavalry Regiment, formerly 3rd Armored Cavalry Regiment ("Brave Rifles"[2]) is a regiment of the United States Army currently stationed at Fort Hood, Texas. The regiment has a history in the United States Army that dates back to 19 May 1846, when it was constituted in the Regular Army as the Regiment of Mounted Riflemen at Jefferson Barracks, Missouri. This unit was reorganized at the start of the American Civil War as the 3rd U. S. Cavalry