3rd Marine Regiment

3rd Marine Regiment
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Unit name	3rd Marine Regiment
Caption	Regimental insignia
Dates	1917–present
Country	United States
Branch	United States Marine Corps
Type	Infantry regiment
Role	Ground combat operations
Size	Regiment
Command structure	1st Marine Division
Garrison	Camp Pendleton
Motto	Vigilance, Valor, Victory
Battle honours	See Honors and Unit Awards

3rd Marine Regiment The 3rd Marine Regiment is an infantry regiment of the United States Marine Corps assigned to the 1st Marine Division and based at Marine Corps Base Camp Pendleton in San Diego County, California. The regiment has served in major 20th- and 21st-century conflicts including the World War I, World War II, Korean War, Vietnam War, Gulf War, Iraq War, and operations in Afghanistan. Its lineage connects to expeditionary deployments in the Pacific and to campaigning with corps and division-level formations such as I Marine Expeditionary Force and III Marine Expeditionary Force.

History

The regiment traces origins to World War I-era mobilization when the United States expanded the United States Marine Corps for expeditionary service alongside the American Expeditionary Forces. During World War II, elements served in the Guadalcanal Campaign, Battle of Tarawa, and the Battle of Saipan under the command relationships with the 1st Marine Division and III Amphibious Corps. In the postwar period, the regiment participated in the Korean War including the Inchon Landing and the Battle of Chosin Reservoir as part of combined operations with the United Nations Command and the U.S. Navy. During the Vietnam War, the regiment rotated units among I Corps (South Vietnam), operating from bases such as Da Nang and participating in operations alongside Army of the Republic of Vietnam formations. The regiment deployed in the 1990–1991 Gulf War during Operation Desert Storm and later provided force packages for Operation Iraqi Freedom and Operation Enduring Freedom with sustained operations in Fallujah and Helmand Province.

Organization and Structure

The regiment is organized under a regimental headquarters with subordinate infantry battalions and support elements. Typical subordinate units include battalions such as 1st Battalion, 3rd Marines; 2nd Battalion, 3rd Marines; and 3rd Battalion, 3rd Marines, each forming light infantry rifle companies supported by weapons companies and headquarters and service companies. The regimental headquarters coordinates with 1st Marine Division staff, Marine Air-Ground Task Force components, and Fleet Marine Force logistics groups. For amphibious operations the regiment integrates with Amphibious Ready Group assets, Naval Expeditionary Forces, and close air support coordinated with Marine Aircraft Group squadrons such as units flying the AV-8B Harrier II and F/A-18 Hornet in joint fires planning.

Deployments and Operations

The regiment has conducted expeditionary assaults, amphibious landings, urban combat, and counterinsurgency operations. In World War II, regimental elements were central to island-hopping campaigns, coordinating with United States Pacific Fleet task forces and Seabees for logistics and base construction. During the Korean War the regiment executed large-scale amphibious maneuvers and cold-weather operations in coordination with United States Army units and Royal Navy liaison elements. Vietnam-era deployments featured search-and-destroy missions, pacification efforts, and combined operations with Republic of Korea Armed Forces and local security forces. In the 21st century, the regiment executed counterinsurgency and stability operations in Iraq and Afghanistan, conducting patrols, convoy security, urban clearing in cities such as Fallujah and Ramadi, and partnering with coalition forces from nations including United Kingdom, Australia, and Canada. The regiment has also participated in humanitarian assistance and disaster relief missions alongside United States Agency for International Development and United Nations agencies during regional crises.

Training and Equipment

Regimental training follows doctrines and standards from Marine Corps Combat Development Command, emphasizing combined arms maneuver, small-unit leadership, marksmanship, and urban operations doctrine derived from historical lessons such as Small Wars Manual guidance. Units conduct live-fire exercises at ranges like Marine Corps Air Ground Combat Center Twentynine Palms and amphibious training with Naval Amphibious Force platforms including Landing Craft Air Cushion and Wasp-class amphibious assault ship integration. Standard infantry equipment includes the M27 Infantry Automatic Rifle, M4 carbine, M240 machine gun, anti-armor systems such as the FGM-148 Javelin, and indirect fire support from M252 mortar systems and coordination with M777 howitzer batteries of the United States Army Field Artillery. Aviation integration uses platforms like the AH-1Z Viper and MV-22 Osprey for close air support and assault support.

Honors and Unit Awards

The regiment and its subordinate units have received campaign streamers and unit citations for service in campaigns such as the Guadalcanal Campaign, Battle of Tarawa, Saipan Campaign, Korean War, and Vietnam Campaign. More recent recognitions include unit commendations for actions during Operation Iraqi Freedom and Operation Enduring Freedom. Individual Marines and leaders from the regiment have been awarded decorations ranging from the Medal of Honor to unit-level awards coordinated by Department of the Navy authorities.

Notable Commanders and Personnel

Commanders and personnel with notable service include leaders who later held senior positions within the United States Marine Corps and joint commands, veterans who participated in major campaigns like Guadalcanal and Chosin Reservoir, and Marines recognized with high honors such as the Navy Cross and Silver Star. Alumni have gone on to serve in institutions such as the National Security Council, senior positions within U.S. Department of Defense, and as instructors at United States Naval Academy and Marine Corps University.

Category:United States Marine Corps regiments Category:1st Marine Division