3rd Marine Division

3rd Marine Division
3dmardivcommstrat · CC BY-SA 4.0 · source
Unit name	3rd Marine Division
Caption	Insignia of the division
Dates	Reactivated 1942; present
Country	United States
Branch	United States Marine Corps
Type	Infantry division
Role	Amphibious assault, ground combat, expeditionary operations
Size	Approximately 15,000 personnel
Command structure	III Marine Expeditionary Force
Garrison	Camp Courtney, Okinawa Prefecture
Motto	Legacy of Valor
Notable commanders	Lewis B. "Chesty" Puller, Raymond G. Davis, Robert E. Hogaboom

3rd Marine Division is a major infantry division of the United States Marine Corps assigned to III Marine Expeditionary Force and headquartered on Okinawa Prefecture at Camp Courtney. The division provides ground combat power for amphibious assault and expeditionary operations, projecting force throughout the Pacific Ocean, East Asia, and Southeast Asia. It has fought in major campaigns including World War II, the Vietnam War, and operations during the Cold War and post‑Cold War era.

History

The division was activated during World War II and participated in the Battle of Bougainville, Battle of Guam (1944), and Battle of Iwo Jima campaigns as part of the Pacific Theater of Operations. Following wartime demobilization, the division was reactivated for Korean War‑era contingency planning and later forward‑deployed to Okinawa Prefecture to deter aggression during the Cold War. During the Vietnam War the division conducted fixed and mobile operations in the I Corps area, engaging in operations such as Operation Hastings, Operation Medina, and the Tet Offensive. In the post‑Vietnam era the division supported bilateral exercises with Japan Self-Defense Forces, Republic of Korea Armed Forces, and participated in multinational training such as RIMPAC and Operation Cobra Gold. Elements were involved in humanitarian assistance and noncombatant evacuation operations during crises in East Timor, Philippines, and the Gulf of Tonkin region.

Organization

The division typically comprises three infantry regiments—3rd Marine Regiment, 4th Marine Regiment, and 9th Marine Regiment (historically activated/deactivated)—supported by Combat Logistics Regiment 3, 1st Battalion, 3rd Marines attachments, an artillery regiment such as 12th Marine Regiment, and an aviation combat element from 1st Marine Aircraft Wing. Command relationships tie the division to III Marine Expeditionary Force and coordinate with theater commands including United States Indo-Pacific Command and allied formations like Japan Ground Self-Defense Force units and the Republic of Korea Marine Corps. Support units include military police elements, engineer battalions, reconnaissance battalions such as 3rd Reconnaissance Battalion, and signals elements integrated with Marine Corps Systems Command standards.

Combat Operations

In World War II the division executed amphibious assaults against entrenched Japanese positions at Bougainville Campaign, Guam (1944), and Iwo Jima, operating alongside United States Navy carrier and amphibious task forces commanded by admirals such as Chester W. Nimitz. In Vietnam War campaigns the division countered People's Army of Vietnam and Viet Cong forces in operations across Quảng Trị Province, Đà Nẵng, and the DMZ (Vietnam), coordinating with units such as 3rd Marine Aircraft Wing and Riverine Forces during riverine and combined arms actions. During the Cold War the division maintained forward posture to deter the Soviet Union and supported allied planning with the Philippine Marine Corps and Royal Australian Regiment during joint exercises. The division has also provided rapid response forces for contingency operations in the Western Pacific, including amphibious evacuations tied to scenarios involving Typhoon Haiyan aftermath coordination with United Nations Office for the Coordination of Humanitarian Affairs partners and multilateral humanitarian assistance missions.

Training and Doctrine

The division conducts combined arms and amphibious training with maritime and land components, integrating doctrine from Marine Corps Doctrinal Publication series and concepts developed by Marine Corps Combat Development Command. Training cycles incorporate large‑scale amphibious rehearsals at Camp Fuji, Camp Schwab, and live‑fire exercises at ranges like Kadena Air Base range complexes. The division participates in multinational exercises such as Cobra Gold, Khaan Quest (when partnered), Talisman Sabre (with Australian Defence Force), and RIMPAC to refine interoperability with Japan Maritime Self-Defense Force, Republic of Korea Navy, and United States Navy amphibious groups. Doctrine emphasizes expeditionary advanced base operations, littoral maneuver, and integration with Marine Expeditionary Unit (MEU) concepts.

Unit Honors and Decorations

Elements of the division received campaign streamers and unit citations for actions in World War II campaigns, Vietnam War phases, and other contingency operations. Decorations include presidential unit citations, Navy Unit Commendation awards, and foreign decorations from allied governments for humanitarian and combat service. Individual Marines from the division have been awarded high honors such as the Medal of Honor, Navy Cross, and Silver Star for actions during combat operations in campaigns like Iwo Jima and Vietnam.

Notable Commanders and Personnel

Prominent leaders who commanded or served with the division include Lewis B. "Chesty" Puller (historical association of prominence), Raymond G. Davis, Robert E. Hogaboom, and other senior officers whose careers connected to commands such as III Marine Expeditionary Force and the 1st Marine Division. Distinguished enlisted and officer personnel from the division have been cited in narratives alongside events like Iwo Jima flag raising, Battle of Khe Sanh support operations, and official histories preserved by institutions like the National Museum of the Marine Corps and the Marine Corps History Division.

Category:United States Marine Corps divisions