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120th Infantry Brigade (Training Support)

The 120th Infantry Brigade is a US Army Reserve training support brigade. The Brigade's mission is to provide pre-mobilization leader and collective training assistance and support. The Brigade's main focus is providing training support, assistance, and evaluation to client units. The Brigade also provides assistance to civilian authorities during peacetime crises and/or natural disasters.

The 120th Infantry Brigade was first constituted on 26 March 1943 in the Army of the United States as Headquarters, 3rd Armored Infantry Group and activated on 31 March 1943 at Camp Chaffee, Arkansas. The unit was reorganized and redesignated on 30 March 1943 as Headquarters, 3rd Armored Group; on 14 September 1943 as Headquarters, 12th Tank Group; and again on 13 December 1943 as Headquarters, 12th Armored Group. During the Second World War the Group participated in 3 campaigns in the European Theater of Operations: Rhineland, Ardennes-Alsace, and Central Europe. Following the end of the Second World War, the unit was inactivated on 20 October 1945 at Camp Gruber, Oklahoma. It was disbanded entirely on 2 July 1952.

The unit was reconstituted on 24 October 1997 in the Regular Army as Headquarters, 120th Infantry Brigade, and activated at Fort Sam Houston, Texas. During 1998, the 39th Infantry Brigade (Separate)'s annual training was held at the Fort Chaffee Maneuver Training Center and Robinson Maneuver Training Area. During annual training, the Brigade was evaluated under Joint Readiness Training Center conditions by the 120th Infantry Brigade from Fort Sam Houston, Texas. The 120th Infantry Brigade was inactivated on 16 October 1999 at Fort Sam Houston, Texas. This inactivation was part of the decision to inactivate the separate training brigades assigned to Fifth US Army and reorganize the capability into a number of training divisions.

The 120th Infantry Brigade was reactivated on 1 December 2006 at Fort Sam Houston, Texas as a training support brigade. The Army's transformation in the 2000s necessitated restructuring the roles and missions of First US Army and Fifth US Army to support reserve component modularity and the Army Force Generation process known as Army Force Generation (ARFORGEN). First US Army's training mission expanded on 16 January 2006 to include training, readiness oversight and mobilization for US Army Reserve and National Guard units throughout the continental United States and two US territories. The transition of the expanded geographic mission began in mid-December 2005 with the transfer of authority between First US Army and Fifth US Army for the Western United States. Previously, First Army trained, mobilized and deployed US Army Reserve and National Guard units in the eastern United States, Puerto Rico and the US Virgin Islands. The 120th Infantry Brigade became assigned to the expanded First US Army as part of Division West.




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