33d Armor Regiment
- Redesignated 8 May 1941 as the 33d Armored Regiment
- Inactivated 10 November 1945 in Germany
- Regiment broken up 7 July 1947 and its elements redesignated as follows:
- Regimental Headquarters and Headquarters Company, Headquarters and Headquarters Company, 1st Battalion, and Companies A, D, E, and F as the 33d Tank Battalion, and remained assigned to the 3d Armored Division
- Headquarters and Headquarters Company, 3d Battalion, and Companies G and H as the Service Company and Companies B and C, respectively, 7th Tank Battalion, and remained assigned to the 3d Armored Division (remainder of the 7th Tank Battalion organized from elements of the 32d Armored Regiment)
- Headquarters and Headquarters Company, 2d Battalion, Companies B, C, and I, Service and Maintenance Companies, and Band disbanded
- (Reconnaissance Company as Troop E, 83d Mechanized Cavalry Reconnaissance Squadron –hereafter separate lineage)
- After 7 July 1947 the above units underwent changes as follows:
- 7th and 33d Tank Battalions activated 15 July 1947 at Fort Knox, Kentucky Reorganized and redesignated 30 July 1948 as the 7th and 33d Medium Tank Battalions, respectively Reorganized and redesignated 15 March 1955 as the 7th and 33d Tank Battalions, respectively 7th and 33d (less Company D) Tank Battalions inactivated 1 October 1957 in Germany and relieved from assignment to the 3d Armored Division
- Headquarters and Headquarters Company, 2d Battalion; Service Company; and Companies B, C, and I, 33d Armored Regiment, reconstituted 28 May 1948 in the Regular Army as Headquarters, Headquarters and Service Company, and Companies B, C, and A, respectively, 62d Heavy Tank Battalion 62d Heavy Tank Battalion assigned 18 June 1948 to the 10th Infantry Division Activated 1 July 1948 at Fort Riley, Kansas Reorganized and redesignated 15 June 1954 as the 62d Tank Battalion Inactivated 1 July 1957 in Germany Relieved 1 October 1957 from assignment to the 10th Infantry Division
- Maintenance Company, 33d Armored Regiment, reconstituted 1 October 1957 in the Regular Army
- 33d and 62d Tank Battalions; Headquarters and Service Company and Companies B and C, 7th Tank Battalion; and Maintenance Company, 33d Armored Regiment, consolidated 1 October 1957 and consolidated unit reorganized and redesignated as the 33d Armor, a parent regiment under the Combat Arms Regimental System
- Withdrawn 16 April 1987 from the Combat Arms Regimental System and reorganized under the United States Army Regimental System