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| 1st Battalion, 3rd Marine Regiment | |
|---|---|
| Unit name | 1st Battalion, 3rd Marine Regiment |
| Country | United States |
| Branch | United States Marine Corps |
| Type | Infantry Battalion |
| Role | Light infantry |
| Size | ~1,000 personnel |
| Command structure | 3rd Marine Regiment, 3rd Marine Division |
| Garrison | Marine Corps Base Hawaii |
1st Battalion, 3rd Marine Regiment is an infantry battalion of the United States Marine Corps assigned to the 3rd Marine Regiment and the 3rd Marine Division, based at Marine Corps Base Hawaii. The battalion has served in major conflicts including World War II, the Korean War, the Vietnam War, and operations in the Global War on Terrorism, earning multiple unit awards and campaign streamers. 1/3 has conducted amphibious assaults, expeditionary operations, counterinsurgency, and stability missions across the Pacific Ocean, Asia, and the Middle East.
The battalion’s mission is to provide a light infantry maneuver element capable of conducting amphibious assault, expeditionary force protection, and sustained combat operations in support of the III Marine Expeditionary Force and MarForPac directives. Subordinate elements include three rifle companies (typically designated A, B, and C), a weapons company providing heavy machine guns, mortars, and anti-armor assets, and a headquarters and service company responsible for logistics, communications, and medical support under the administrative control of the 3rd Marine Regiment and operational control of division-level commands such as 3rd Marine Division and Task Force 58 during deployments.
Activated and reactivated through multiple organizational changes, the battalion’s lineage traces through pre-war formations in the Pacific Theater and Cold War reorganizations under the Fleet Marine Force. Its deployments and occupation duties have linked the unit to operations associated with the Guadalcanal Campaign, the Battle of Okinawa, the defense of Pusan Perimeter, the counteroffensives centered on Hue, and stability operations during Operation Iraqi Freedom and Operation Enduring Freedom. The battalion’s evolution reflects broader doctrinal shifts influenced by leaders and institutions such as the Commandant of the Marine Corps, Marine Corps Warfighting Publication, and Marine Corps University.
During World War II, elements of the regiment participated in amphibious campaigns across the Central Pacific. The battalion’s predecessors fought in actions related to the Guadalcanal Campaign, Bougainville Campaign, the Gilbert and Marshall Islands campaign, and the Battle of Saipan, operating alongside units from the United States Navy, coordinated with Admiral Chester W. Nimitz’s Pacific command and supported by aviation elements like the Marine Aircraft Group 23. These campaigns involved close combat with Imperial Japanese Army and Imperial Japanese Navy forces, coordination with Underwater Demolition Teams and naval gunfire from United States Seventh Fleet assets, and demonstrated integration of amphibious doctrine developed from earlier engagements such as the Gallipoli Campaign lessons adapted for the Pacific island-hopping strategy advocated by planners in Washington, D.C..
In the Korean War, the battalion or its antecedents operated in the Pusan Perimeter defense and participated in the amphibious Incheon landing and subsequent advances northward, confronting Korean People’s Army forces and later People's Volunteer Army (China) interventions. The unit fought in engagements around places such as Seoul, the Chosin Reservoir area, and the Imjin River region during maneuver and defensive operations executed with the Eighth United States Army and the United Nations Command. These operations required winter warfare adaptations, coordination with United States Air Force close air support, logistical sustainment via Military Sea Transportation Service, and interaction with multinational contingents from nations including the United Kingdom and South Korea.
Deployed to Republic of Vietnam during the Vietnam War, the battalion conducted search-and-destroy operations, pacification efforts, and highway security missions in provinces contested by the Army of the Republic of Vietnam and the People’s Army of Vietnam. Operating within areas such as I Corps Tactical Zone and supporting operations like Operation Hastings and Operation Prairie, the battalion engaged in jungle warfare, fire support coordination with Marine Aircraft Group aviation, and combined operations with Army of the Republic of Vietnam and U.S. Navy riverine units. The battalion’s actions intersected with strategic initiatives directed by the MACV command and the Secretary of Defense’s theater guidance.
Following Cold War drawdowns, the battalion participated in humanitarian assistance, peacekeeping, and expeditionary deployments, including rotations to Okinawa, cooperative training with Japan Self-Defense Forces, and exercises such as RIMPAC and Cobra Gold. In the Global War on Terrorism, companies from the battalion deployed in support of Operation Iraqi Freedom and Operation Enduring Freedom, conducting counterinsurgency, convoy security, and partnered training with host-nation forces like the Iraqi Army and the Afghan National Army. The battalion also engaged in disaster relief efforts responding to typhoons alongside agencies such as the United States Agency for International Development and allied forces including Australia and New Zealand.
The battalion has received unit awards and campaign streamers recognizing service in campaigns associated with World War II, Korean War, and Vietnam War, as well as later citations for Operation Iraqi Freedom and Operation Enduring Freedom deployments. Decorations include recommendations referencing awards such as the Presidential Unit Citation, Navy Unit Commendation, and Meritorious Unit Commendation earned by Marine Corps units for collective valor and meritorious service in named campaigns coordinated by commands like the Department of Defense and the Joint Chiefs of Staff.
Category:Battalions of the United States Marine Corps Category:3rd Marine Division