23d Marine Regiment (United States)

The 23rd Marine Regiment (23rd Marines) is a reserve infantry regiment of the United States Marine Corps. It is headquartered in San Bruno, California and falls under the command of the 4th Marine Division and the Marine Forces Reserve. The regiment comprises twenty units which are geographically dispersed throughout eight states from California to Alabama. The regiment consists of Marine reservists, active duty Marines and active duty Navy personnel. The regimental headquarters is located in San Bruno, California.

To provide administratively and medically ready Marines and Sailors; and trains ground combat formations to augment and reinforce the active component in order to support Combatant Commands and service level requirementslocate.

The 23rd Marine Regiment was activated on 20 July 1942 at New River, North Carolina; was assigned to the 4th Marine Division in February 1943 and relocated during July 1943 to Camp Pendleton, California. Regiment's first commanding officer was Colonel Louis R. Jones. During World War II, the 23rd Marines participated in the following campaigns: Kwajalein, Saipan, Tinian, and the Battle of Iwo Jima. During the fierce fighting which occurred in the Pacific Theater, four Marines of the 23rd Marine Regiment were awarded the Medal of Honor for valor:
Richard B. Anderson, 2/23, Kwajalein
Joseph W. Ozbourn, 1/23, Tinian
Darrell S. Cole, 1/23, Iwo Jima
Douglas T. Jacobson, 3/23, Iwo Jima

Starting at Kwajalein, the 23rd Marines was assigned to land on beaches red 2 & 3 at Roi. That island was taken in a day. Saipan came next with the 23d Marines assigned to blue beaches 1 & 2 with third Battalion 20th Marines as their Shore Party (121st Seabees). Across the strait at Tinian the 23rd Marines was the assault reserve landing on beach white 2. The 121st CB was still assigned to them. For the assault on Iwo Jima the 23rd Marines was assigned to yellow beaches with 1/23 the left assault Battalion on yellow beach 1. The right assault Battalion 2/23 was on yellow beach 2 and 3/23 was the assault reserve. The 23rd Marines did not have a Pioneer Battalion for the assault Shore Party so the Seabees of Naval Mobile Construction Battalion 133 were task assigned that duty until relieved D plus 18. The 23d Marines made four assaults during WWII with Seabees as their beach support each time. In October 1945, the regiment was again relocated to Camp Pendleton and was subsequently inactivated on 15 November 1945.

Lieutenant Colonel William B. Onley (20 July 1942 2 September 1942)
Colonel Louis R. Jones (3 September 1942 15 October 1944)
Colonel Walter W. Wensinger (16 October 1944 9 April 1945)
Lieutenant Colonel Edward J. Dillon (10 April 1945 2 May 1945)
Colonel Leonard B. Cresswell (3 May 1945 15 November 1945)

The 23rd Marine Regiment was reactivated on 1 February 1966 in Alameda, California and assigned during the same month to the 4th Marine Division, USMCR. 3d Battalion, 23rd Marines was activated in Nov 1990 and deployed to Saudi Arabia for Desert Shield. 3/23 was attached to the 8th Marine Regiment of the 2nd Marine Division and deployed along the Kuwaiti/Saudi Arabian border conducting patrolling and security operations. Two days before G Day, 3/23 attacked into Kuwait at Umm Gudair to secure forward artillery positions for the support of the attack into Kuwait. With this action, 3/23 became the first unit of the 2nd Marine Division to enter combat since World War II. 3/23 continued to advance as part of 8th Marines, fighting actions into Kuwait City when the ceasefire was called. In December 1990, the 2nd Battalion, 1st Battalion, and Headquarters Co. were activated in January 1991 as part of the 23d Marines which were mobilized by Presidential call up to support Operation Desert Shield and Operation Desert Storm. 2d Battalion, 23rd Marines responded to the eruption of Mt. Pinatubo in the Philippine islands in 1991 and provided critical humanitarian relief.

The 23rd Marine Regiment, either in whole or in part, have been activated multiple times including 2003, 2006, and 2009. In June, 2012, the 23rd Marine Regimental Headquarters Company deployed to Barbados, Caribbean for Tradewinds 2012.