The division was then centered around three infantry regiments: the 19th Infantry Regiment and the 21st Infantry Regiment from the old Hawaiian Division, and the 299th Infantry Regiment from the Hawaii National Guard. In July 1942, the 299th Infantry was inactivated after its ranks were depleted by the transfer of many Nisei (second-generation Japanese-Americans) to form the 100th Infantry Battalion, and the 25th Infantry Division's 298th Infantry Regiment was reassigned to the 24th. Also part of the division were the 13th Field Artillery Battalion, the 52nd Field Artillery Battalion, the 63rd Field Artillery Battalion, the 11th Field Artillery Battalion, the 24th Signal Company, the 724th Ordnance Light Maintenance Company, the 24th Quartermaster Company, the 24th Reconnaissance Troop, the 3rd Engineer Combat Battalion, the 24th Medical Battalion, and the 24th Counterintelligence Corps Detachment.
