1st Cavalry Regiment (United States) - Assignment Overview

Assignment Overview

• 1855 – Regiment organized at Jefferson Barracks in Missouri
• 1856 – Regimental Headquarters moved to Fort Tejon, California
• 1861 – 1st Dragoons was redesignated as 1st Cavalry Regiment in August.
• 1917 – The regiment was assigned to the 15th Cavalry Division in December. This assignment was revoked in May 1918.
• 1921 – 1st Cavalry Regiment was assigned to the 1st Cavalry Division on 20 August.
• 1933 – The regiment was reorganized and redesignated as 1st Cavalry Regiment (Mechanized) on 16 January.
• 1940 – The regiment was redesignated as 1st Armored Regiment (Light), and assigned to the 1st Armored Division on 15 July.
• 1944 – On 20 July, 1st Armored Regiment was reorganized. 2nd Battalion was deactivated and the remainder was reorganized and redesignated as 1st Tank Battalion.
• 1946 – On 1 May, 1st Tank Battalion was converted and redesignated as the 1st Constabulary Squadron, and concurrently relieved from assignment to 1st Armored Division, and assigned to the 15th Constabulary Regiment.
• 1948 – On 20 December, 1st Constabulary Squadron was reconverted and redesignated as 1st Medium Tank Battalion, reassigned to the 1st Armored Division, and deactivated.
• 1951 – On 27 February, 2nd Battalion. 1st Armored Regiment was reconstituted, and redesignated as 100th Tank Battalion. On 7 March, 1st Medium Tank Battalion was reactivated as part of 1st Armored Division at Fort Hood, Texas.