3rd Battalion - 66th Armor Regiment
The 3rd Battalion, 66th Armored Regiment was inactivated as of 16 December, 2004, as part of the 4th Infantry Division's new modular transformation.
The 3rd Battalion, 66th Armor Regiment, was originally organized in February 1918 at Camp Upton, NY, as Company C, 1st Separate Battalion, Heavy Tank Service, 65th Engineers. It reorganized and was redesignated on 16 March, 1918, as Company C, 1st Heavy Battalion, Tank Service. It reorganized and was redesignated again on 16 April, 1918, as Company C, 41st Heavy Battalion, Tank Corps, and on 11 June, 1918, as Company C, 301st Battalion, Tank Corps.
Expanded, it was reorganized, and redesignated on 22 June, 1921, as Companies A, B, and C, 16th Tank Battalion. Company C was later reorganized and redesignated on 1 September, 1929, as Company C, 1st Tank Regiment. It was converted and redesignated on 25 October, 1932, as Company C, 66th Infantry (Light Tanks), and on 15 July, 1940, as Company C, 66th Armored Regiment, an element of the 2d Armored Division. It was again reorganized and redesignated on 25 March, 1946, as Company C, 66th Tank Battalion, and remained an element of the 2d Armored Division.
The unit was redesignated on 5 January, 1949, as Company C, 66th Medium Tank Battalion, and on 1 April, 1953, as Company C, 66th Tank Battalion. It inactivated on 1 July, 1957, and was relieved from assignment to the 2d Armored Division.
The unit reorganized and was redesignated on 10 June, 1958, as Headquarters and Headquarters Company, 3d Medium Tank Battalion, 66th Armor (with its organic elements concurrently constituted). The battalion activated on 25 June, 1958, at Fort Benning, GA. It inactivated on 25 June, 1959, at Fort Benning, GA.
Headquarters and Headquarters Company was redesignated on 9 September, 1959, as Company C, 66th Armor, and assigned to the 1st Infantry Brigade (the remainder of 3d Medium Tank Battalion, 66th Armor, concurrently disbanded). It activated on 24 September, 1959, at Fort Benning, GA, and inactivated on 24 September, 1962, at Fort Benning, GA, and was relieved from assignment to the 1st Infantry Brigade.
Redesignated on 8 August, 1963, as Headquarters and Headquarters Company, 3d Battalion, 66th Armor (with its organic elements concurrently constituted), the battalion activated 12 August, 1963, at Fort Hood, TX, where it inactivated on 15 October, 1965.
The unit was assigned on 1 September, 1980, to the 2d Armored Division and activated at Fort Hood, TX. It inactivated on 15 April, 1992, in Germany.
The 3rd Battalion reactivated on 16 December, 1992, at Fort Hood, TX. It was relieved on 16 January, 1996, from assignment to the 2d Armored Division and reassigned to the 4th Infantry Division.
