21st Marine Regiment (United States)

21st Marine Regiment
Active	1942 —45
Country	United States
Branch	United States Marine Corps
Type	Infantry regiment
Engagements	World War II * Battle of Bougainville * Battle of Guam * Battle of Iwo Jima
Commanders
Notable commanders	Robert Blake Hartnoll J. Withers

The 21st Marine Regiment (21st Marines) was an infantry regiment of the United States Marine Corps. Activated for service in World War II, they fought in the battles of Bougainville, Guam and Iwo Jima. They fell under the 3rd Marine Division and were deactivated after the end of the war on December 20, 1945.

The regiment was composed of three infantry battalions and one headquarters battalion:

The 21st Marine Regiment was activated on July 14, 1942 at Camp Elliot, San Diego, California but was actually organized at New River, North Carolina. Many of the first members of the regiment came from the 6th Marine Regiment. They were assigned to the 3rd Marine Division, however from January to June 1943 they were an independent regiment. During the war, the regiment took part in the Battle of Bougainville, Battle of Guam (Fig. 1) and the Battle of Iwo Jima. Following the Japanese surrender, 21st Marines moved to Guam where they were inactivated on December 20, 1945.

On Iwo the 21st RCT relieved the decimated 23rd on D-plus3 That placed the 21st in the 4th Marines ZofA assigned to yellow beach 2.(Fig. 2) The front lines were in the vicinities of Motoyama Airfields #1 and #2. On D-plus6 the Regiment reverted to the 3rd Marine Divisions control and was passed through by the 9th Marines.

Hershel W. Williams - Medal of Honor recipient

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