In 1955, the fort's utilization changed from training and educational center to that of being the home base for a major infantry division. In that year, the 10th Division rotated to Germany as part of "Operation Gyroscope" and was replaced by the 1st Infantry Division. Elements of the Big Red One began arriving in July 1955 and over the next four years the remaining units arrived, the last being the 2nd Battle Group, 8th Infantry, in December, 1959. The initial units occupied barracks located in Camp Funston, until new barracks were built on Custer Hill. Ultimately, the 1st Battle Group, 5th Infantry would be stationed at Funston, with the other units of the division divided between Custer Hill, Forsythe and Main post.