18th Marine Regiment (United States)

18th Marine Regiment
Active	18 September 1942 - 16 August 1944
Country	United States
Allegiance	United States
Branch	United States Marine Corps
Type	Engineer Regiment
Part of	2nd Marine Division
Engagements	World War II * Battle of Tarawa * Battle of Tinian * Battle of Saipan

The 18th Marine Regiment was a composite engineer regiment of the United States Marine Corps subordinate to the 2nd Marine Division. It was disbanded during the war, with the 1st and 2nd battalions remaining in the Division.^[1]

Subordinate units

The regiment was a composite of three different types of battalions^[2] and a headquarters and service company:

1st Battalion, 18th Marines, A, B, & C Companies 2nd Engineer Battalion now 2nd Combat Engineer Battalion
2nd Battalion, 18th Marines D, E, & F Companies 2nd Pioneer Battalion
3rd Battalion, 18th Marines, G, H, & I Companies 18th Naval Construction Battalion (now Naval Mobile Construction Battalion 18 or NMCB 18)^[3]

18th Marines was activated on 8 September 1942 and participated in actions at Tarawa, Saipan and Tinian. It was inactivated on 16 August 1944.^[3]

Colonel Elmer E. Hall: 8 September 1942
Colonel Ewart S. Laue: 31 August - 3 October 1943; 24–29 February 1944; 7–9 April 1944; 22–24 April 1944
Colonel Cyril W. Martyr: 4 October 1943 - 23 February 1944; 1 March - 6 April 1944; 25 June - 15 August 1944
LtCol Russell Lloyd: 10-14, 19-21, 25–30 April 1944; 1–11 May 1944; 1–24 June 1944^[3]

↑ U.S. Marine Corps World War II Order of Battle Fleet Marine Force Ground Units, Rottman p. 220
↑ Battle Orders - US Marine Corps Pacific Theater of Operations 1943-44, Gordon L Rottman, Osprey Publishing, p. 13
1 2 3 Rottman, Gordon L. (2002). US Marine Corps World War II order of battle : ground and air units in the Pacific War, 1939-1945, p. 218 (1 ed.). Westport, Connecticut: Greenwood Press. pp. 218–220. ISBN 9780313319068.

Rottman, Gordon L. (2002). U.S. Marine Corps World War II Order of Battle - Ground and Air Units in the Pacific War, 1939 - 1945.’’. Greenwood Press. ISBN 0-313-31906-5.

Leadership

Major
commands

Structure

Personnel
and training

Personnel	Personnel Rank insignia MOS Notable Marines Historical Marines Marine Astronauts Criminal Investigation Division Judge Advocate Division Chaplain of the Marine Corps Associated organizations
Training	Training Recruit Training School of Infantry Officer Candidates School The Basic School Martial Arts Program

Uniforms
and equipment

History
and traditions

2nd Marine Division
2nd Marines	1st Battalion 2nd Battalion 3rd Battalion 3rd Battalion, 9th Marines
6th Marines	1st Battalion 2nd Battalion 3rd Battalion 2nd Battalion, 9th Marines
8th Marines	1st Battalion 2nd Battalion 3rd Battalion 1st Battalion, 9th Marines
10th Marines	1st Battalion 2nd Battalion 3rd Battalion 5th Battalion
Other Battalions	2nd Combat Engineer 2nd Light Armored Reconnaissance 2nd Reconnaissance 2nd Tank 2nd Assault Amphibian

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