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181st Infantry Brigade (Training Support)

The 181st Infantry Brigade (Training Support) was first constituted on 5 August 1917 in the National Army as Headquarters, 181st Infantry Brigade, and assigned to the 91st Division. It was organized on 4 September 1917 at Camp Lewis, Washington. Sent to Europe during World War I, the Brigade participated in 3 campaigns: Ypres-Lys, Meuse-Argonne, and Lorraine 1918. Following the end of the First World War, the unit was demobilized in April 1919 at Camp Kearny, California.

The unit was reconstituted on 24 June 1921 in the Organized Reserves as Headquarters and Headquarters Company, 181st Infantry Brigade, and assigned to the 91st Division. It was organized in November 1921 at San Francisco, California. It was redesignated on 23 March 1925 as Headquarters and Headquarters Company, 181st Brigade and again on 24 August 1936 as Headquarters and Headquarters Company, 181st Infantry Brigade.

The unit was converted and redesignated on 6 April 1942 as the 91st Reconnaissance Troop (less 3rd Platoon), 91st Division (Headquarters and Headquarters Company, 182nd Infantry Brigade was concurrently converted and redesignated as the 3rd Platoon, 91st Reconnaissance Troop, 91st Division). The Troop was ordered into active military service on 15 August 1942 and reorganized at Camp White, Oregon, as the 91st Cavalry Reconnaissance Troop, an element of the 91st Infantry Division. It was reorganized and redesignated again on 15 August 1943 as the 91st Reconnaissance Troop, Mechanized. During the Second World War, the unit participated in 3 campaigns in the European Theater of Operations: Rome-Arno, North Apennines, and Po Valley. Following the end of the Second World War, the unit was inactivated on 19 November 1945 at Camp Rucker, Alabama.

The unit was reactivated on 25 January 1947 at San Francisco, California, as the 91st Mechanized Cavalry Reconnaissance Troop. It was reorganized and redesignated on 16 March 1949 as the 91st Reconnaissance Company. Inactivated on 17 May 1954 at San Francisco, California, the unit was reactivated on 17 April 1956 at Sonora, California, before being disbanded there on 1 May 1959. During this period the Organized Reserves was redesignated on 25 March 1948 as the Organized Reserve Corps, which in turn was redesignated on 9 July 1952 as the Army Reserve. The 91st Reconnaissance Company remained a part of this organization throughout these redesignations.

The unit was reconstituted (less 3rd Platoon) on 27 March 1963 in the Regular Army as Headquarters and Headquarters Company, 2nd Brigade, 63rd Infantry Division (3rd Platoon, 91st Reconnaissance Company thereafter had a separate lineage). The unit was activated on 1 April 1963 at Pasadena, California and inactivated there on 31 December 1965.

The unit was redesignated on 1 December 2006 as Headquarters and Headquarters Company, 181st Infantry Brigade with its Headquarters concurrently activated at Fort McCoy, Wisconsin. There it was established as a training support brigade.