90th Infantry Regiment (United States)

During World War II, the 90th Infantry was again activated with the 10th Light Division (the future 10th Mountain) in mid-1943, but was transferred to become a nondivisional separate training unit in early 1944, inactivating in mid-1945.

Van Schaick, who was replaced by Colonel Henry L. Wagner in early September after the former transferred to command the division trains.

[4] Following the Attack on Pearl Harbor, which resulted in the United States entry into World War II, the regiment was reconstituted on 10 July 1943, and activated five days later at Camp Hale, Colorado with the 10th Light Division (Alpine), using a cadre from the 105th, 106th, and 165th Infantry Regiments of the 27th Infantry Division, then in Hawaii.

[6] The 87th Infantry, one of the Army's other mountain regiments, had previously conducted operations in the Territory of Alaska during the Aleutian Islands campaign in mid-1943, and was returned to the United States via Canada in December 1943.

At Camp Carson, the 611-man cadre of the 90th Infantry Regiment provided an accelerated six-week course of infantry training (four weeks of familiarization, qualification, and transition firing, and two weeks of tactical training) to 2,900 men, who were formerly members of disbanded anti-aircraft and tank destroyer units or who had volunteered for transfer to the infantry from other branches of the Army,[7] under the command of Colonel James E. Graham.