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3rd Battalion, 66th Armor Regiment
"Black Knights"
"Iron Knights"

The 3rd Battalion, 66th Armor Regiment, was originally organized in February 1918 at Camp Upton, New York as Company C, 1st Separate Battalion, Heavy Tank Service, 65th Engineers. It was reorganized and redesignated on 16 March 1918 as Company C, 1st Heavy Battalion, Tank Service, on 16 April 1918 as Company C, 41st Heavy Battalion, Tank Corps, and on 11 June 1918 as Company C, 301st Battalion, Tank Corps. During the First World War, the unit participated in 3 camapigns: Somme Offensive, St. Mihiel, and Meuse-Argonne

The unit was expanded, reorganized, and redesignated on 22 June, 1921, as Companies A, B, and C, 16th Tank Battalion. Companies A and B subsequently had a separate lineage. Company C, 16th Tank Battalion 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).

On 15 July 1940, Company C, 66th Infantry (Light Tanks) was converted and redesignated as Company C, 66th Armored Regiment, an element of the 2nd Armored Division. During the Second World War, the unit participated in 7 campaigns: Algeria-French Morocco (with arrowhead indicating participation in the initial assault), Sicily (with arrowhead), Normandy, Northern France, Rhineland, Ardennes-Alsace, and Central Europe. After the war it was reorganized and redesignated on 25 March 1946 as Company C, 66th Tank Battalion, and remained an element of the 2nd 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. During the Korea War the unit participated in 8 campaigns: UN Defensive, UN Offensive, CCF Intervention, First UN Counteroffensive, CCF Spring Offensive, UN Summer-Fall Offensive, Second Korean Winter, and Korea Summer 1953.

The unit was inactivated on 1 July 1957, and was relieved from assignment to the 2nd Armored Division. The unit was reorganized and redesignated on 10 June 1958, as Headquarters and Headquarters Company, 3rd Medium Tank Battalion, 66th Armor, with its organic elements concurrently constituted. The Battalion activated on 25 June 1958, at Fort Benning, Georgia. The Battalion was inactivated on 25 June 1959, at Fort Benning, Georgia.

Headquarters and Headquarters Company, 3rd Medium Tank Battalion, 66th Armor was redesignated on 9 September 1959, as Company C, 66th Armor, and assigned to the 1st Infantry Brigade. The remainder of 3rd Medium Tank Battalion, 66th Armor was concurrently disbanded. The unit was reactivated on 24 September 1959 at Fort Benning, Georgia. It was inactivated on 24 September 1962 at Fort Benning, Georgia and was relieved from assignment to the 1st Infantry Brigade.

The unit was redesignated on 8 August, 1963, as Headquarters and Headquarters Company, 3rd Battalion, 66th Armor, with its organic elements concurrently constituted. The Battalion was reactivated 12 August 1963 at Fort Hood, Texas. It was inactivated there on 15 October 1965.

The Battalion was assigned on 1 September, 1980 to the 2nd Armored Division and activated at Fort Hood, Texas. 3-66th Armor followed the 2nd Armored Division to Europe, deploying to Germany. It deployed from there in 1990 in support of Operation Desert Shield, and subsequently participated in Operation Desert Storm. In total the unit gained three campaign streamers for operations in southwest Asia: Defense of Saudi Arabia, Liberation and Defense of Kuwait, Cease-Fire. After returning from southwest Asia, the Battalion was subsequently inactivated on 15 April 1992 in Germany.

The 3rd Battalion, 66th Armor was reactivated on 16 December, 1992, at Fort Hood, Texas. It was relieved on 16 January, 1996, from assignment to the 2nd Armored Division and reassigned to the 4th Infantry Division. There it became an element of the 1st Brigade, 4th Infantry Division.

In 2003, the 3rd Battalion, 66th Armor returned to southwest Asia in support of Operation Iraqi Freedom. It served there as an element of the 1st Brigade, 4th Infantry Division, returning in 2004. Following its return, the unit was inactivated as of 16 December 2004 and its personnel reflagged as the 7th Squadron, 10th Cavalry Regiment as part of the transformation of the 4th Infantry Division to the US Army's modular force structure.

The Battalion was reactivated in 2008 in Germany as part of the 172nd Infantry Brigade (Separate). 1st Battalion, 77th Armor was concurrently inactivated and reflagged as 3rd Battalion, 66th Armor, as part of the reflagging of the 2nd Brigade, 1st Infantry Division as the 172nd Infanty Brigade (Separate).




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