18th Marine Regiment (United States)

The 18th Marine Regiment was an 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.

Subordinate units
The regiment consisted of three battalions and a headquarters and service company:


 * 1st Battalion, 18th Marines, now 2nd Combat Engineer Battalion
 * 2nd Battalion, 18th Marines
 * 3rd Battalion, 18th Marines, now NMCB 18

The 1st Battalion was an engineer battalion, the 2nd was a pioneer battalion and the 3rd a Naval Construction Battalion.

World War II
18th Marines participated in actions at Tarawa, Tinian and Saipan.