The brigade HHC was reconstituted on 15 April 1966 in the Regular Army and activated at Schofield Barracks, Hawaii on 1 July of that year. The brigade was formed in order to replace the 25th Infantry Division, stationed at Schofield Barracks, after the deployment of the latter to Vietnam; it formed part of the army's strategic reserve. Its designation was selected under the assumption that the 6th Infantry Division would be soon reactivated. Organized as a separate infantry brigade, it initially also included three infantry battalions – the 3rd Battalion, 1st Infantry, 4th Battalion, 3rd Infantry, and 1st Battalion, 20th Infantry – as well as the 6th Support Battalion, a reconnaissance troop (Troop E, 1st Cavalry), and a military police company. However, a lack of the necessary personnel and equipment prevented the organization of the field artillery battalion, engineer company, and signal platoon that completed the structure of a separate brigade. Despite its reduced strength, the 11th began training and ultimately organized the remaining units at Fort Schofield. Its towed 105 mm howitzer direct support field artillery battalion, the 6th Battalion, 11th Artillery, was activated on 1 March 1967, followed by the 6th Engineer Company on 15 June. A fourth infantry battalion, the 4th Battalion, 21st Infantry, was activated at Schofield on 1 November.