The 10th Mountain Division was raised in the Army of the United States in 1943. The 24th Infantry Division headquarters inherited the lineage of the Hawaiian Division's headquarters, while the 25th Infantry Division was raised in the Army of the United States. The Hawaiian Division, "which was the closest thing to a full-strength division in the interwar American Army." was split on 1 October 1941 to create the 24th and 25th Infantry Divisions. By the mid-1920s, most of the divisions' inactive units were staffed with Organized Reserve officers as Regular Army Inactive units. Only the division commander and a few staff officers remained to carry out minimal division administrative functions, and neither division exercised true command functions over their units." The 2nd Infantry Division remained the most functional stateside division, as it was concentrated entirely at Fort Sam Houston, Texas. Within a few years, the headquarters of the 1st and 3rd Infantry Divisions "almost ceased to exist. Because of funding cuts, in September 1921, the 4th through 9th Infantry Divisions were mostly inactivated. The 1st through 25th Infantry Divisions, excepting the 10th Mountain Division, were raised in the Regular Army or the Army of the United States prior to American involvement in World War II. Ordered into active military service or activated It was dropped from the mobilization program in 1943.Īirborne Divisions Airborne Divisions The 15th Airborne Division was constituted, but never activated. The 82nd Airborne Division was originally the 82nd Infantry Division of the Organized Reserve, and after being ordered into active military service on 25 March 1942, was converted to an airborne division on 15 August 1942 the 101st Infantry Division was disbanded in the Organized Reserve on 15 August 1942, and was concurrently reconstituted and activated in the Army of the United States as an airborne division on the same date. Several divisions were "constituted" (placed on the rolls of the Army and contemplated for organization) but never actually activated, and "phantom" units were also "raised" on paper during the war to confuse the Germans. Additionally, due to the US Army's method of employment combined with events of the war, the United States did not suffer the destruction of any of its division-size units during the conflict, except for the Philippine Division in 1942. The number of divisions fielded by the United States Army in relation to the population and industrial capacity of the country, in comparison to the number of divisions fielded by various other Allied and Axis countries, has been called "the 90-Division Gamble".
By the end of the war, the nation had fielded nearly one hundred.
The United States began the war with only a handful of active divisions: five infantry and one cavalry.
The following is a list of United States Army and United States Marine Corps divisions of World War II. See also: Formations of the United States Army during World War II
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