120th Infantry Brigade History
Constituted 26 March 1943 in the Army of the United States as Headquarters, 3d
Armored Infantry Group.
Activated 31 March 1943 at Camp Chaffee, Arkansas.
Reorganized and re-designated 30 March 1943 as Headquarters, 3d Armored Group.
Reorganized and re-designated
14 September 1943 as
Headquarters, 12th Tank
Group.
Reorganized and re-designated
13 December 1943 as
Headquarters, 12th Armored
Group.
Inactivated 20 October 1945
at Camp Gruber, Oklahoma.
Disbanded 2 July 1952.
Reconstituted 24 October
1997 in the Regular Army as
Headquarters, 120th Infantry
Brigade, and activated at
Fort Sam Houston, Texas.
Inactivated 16 October 1999
at Fort Sam Houston, Texas.
Activated 1 December 2006 at
Fort Sam Houston, Texas.