1st Marine Division (United States)

E1161

United States Marine Corps division infantry division

The 1st Marine Division (United States) is a storied infantry division of the U.S. Marine Corps renowned for its pivotal combat role in major conflicts from World War II through the present.

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All labels observed (8)

Label	Occurrences
1st Marine Division	89
1st Marine Division (United States) canonical	8
U.S. 1st Marine Division	3
1st MarDiv	1
1st Marine Division (USMC)	1
1st Marine Division (depicted)	1
First Marine Division	1
U.S. 1st Marine Division elements	1

How this entity was disambiguated

This entity first appeared as the object of triple T5817 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: 1st Marine Division (United States)
Context triple: [Operation Watchtower, involvedUnit, 1st Marine Division (United States)]

A. United States Army
The United States Army is the primary land warfare service branch of the U.S. Armed Forces, responsible for ground-based military operations and national defense.
B. United States Navy
The United States Navy is the maritime service branch of the U.S. Armed Forces, responsible for naval warfare, power projection, and maintaining freedom of navigation across the world’s oceans.
C. United States Army Signal Corps
The United States Army Signal Corps is the branch of the U.S. Army responsible for developing, managing, and supporting military communications and information systems.
D. Civilian Conservation Corps
The Civilian Conservation Corps was a New Deal work relief program that provided jobs to young men during the Great Depression through conservation and public lands projects across the United States.
E. Office of Naval Research
The Office of Naval Research is a U.S. government agency that coordinates, executes, and promotes science and technology programs for the United States Navy and Marine Corps.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: 1st Marine Division (United States)
Target entity description: The 1st Marine Division (United States) is a storied infantry division of the U.S. Marine Corps renowned for its pivotal combat role in major conflicts from World War II through the present.

A. United States Army
The United States Army is the primary land warfare service branch of the U.S. Armed Forces, responsible for ground-based military operations and national defense.
B. United States Navy
The United States Navy is the maritime service branch of the U.S. Armed Forces, responsible for naval warfare, power projection, and maintaining freedom of navigation across the world’s oceans.
C. United States Army Signal Corps
The United States Army Signal Corps is the branch of the U.S. Army responsible for developing, managing, and supporting military communications and information systems.
D. Civilian Conservation Corps
The Civilian Conservation Corps was a New Deal work relief program that provided jobs to young men during the Great Depression through conservation and public lands projects across the United States.
E. Office of Naval Research
The Office of Naval Research is a U.S. government agency that coordinates, executes, and promotes science and technology programs for the United States Navy and Marine Corps.
F. None of above. chosen

Statements (51)

Predicate	Object
instanceOf	United States Marine Corps division ⓘ infantry division ⓘ
activePeriod	1941–present ⓘ
awardedFor	heroism in combat ⓘ
conflict	Global War on Terrorism ⓘ Gulf War ⓘ Iraq War ⓘ Korean War ⓘ Vietnam War ⓘ War in Afghanistan (2001–2021) ⓘ World War II ⓘ
country	United States of America ⓘ
decoration	Meritorious Unit Commendation ⓘ Navy Unit Commendation ⓘ Presidential Unit Citation (United States) ⓘ
formedIn	1941 ⓘ
garrison	Camp Pendleton, California ⓘ Marine Corps Base Camp Pendleton ⓘ
insigniaText	Guadalcanal ⓘ
militaryBranch	United States Marine Corps ⓘ
motto	No Better Friend, No Worse Enemy ⓘ
nickname	Blue Diamond ⓘ The Old Breed ⓘ
notableBattle	2003 invasion of Iraq ⓘ Battle of Cape Gloucester ⓘ Battle of Chosin Reservoir ⓘ Battle of Guadalcanal ⓘ Battle of Hue ⓘ Battle of Inchon ⓘ linked to: Inchon Landing Battle of Okinawa ⓘ Battle of Peleliu ⓘ Operation Desert Storm ⓘ linked to: Gulf War Second Battle of Fallujah ⓘ
partOf	I Marine Expeditionary Force ⓘ
role	amphibious assault ⓘ expeditionary warfare ⓘ mechanized infantry operations ⓘ
subunit	11th Marine Regiment ⓘ 1st Combat Engineer Battalion ⓘ 1st Light Armored Reconnaissance Battalion ⓘ 1st Marine Regiment ⓘ 1st Reconnaissance Battalion ⓘ 1st Tank Battalion ⓘ 5th Marine Regiment ⓘ 7th Marine Regiment ⓘ
symbol	blue diamond insignia ⓘ
theater	Korean Peninsula ⓘ Middle East ⓘ Pacific Theater of World War II ⓘ linked to: Pacific War Southeast Asia ⓘ
type	ground combat element ⓘ

How these facts were elicited

Referenced by (105)

Full triples — surface form annotated when it differs from this entity's canonical label.

Operation Watchtower → involvedUnit → 1st Marine Division (United States) ⓘ

Battle of Guadalcanal → notableUnit → 1st Marine Division (United States) ⓘ

Blue Diamond → refersTo → 1st Marine Division ⓘ