The 18th Marine Regiment was an engineer

Engineer

An engineer is a professional practitioner of engineering, concerned with applying scientific knowledge, mathematics and ingenuity to develop solutions for technical problems. Engineers design materials, structures, machines and systems while considering the limitations imposed by practicality,...

 regiment

Regiment

A regiment is a major tactical military unit, composed of variable numbers of batteries, squadrons or battalions, commanded by a colonel or lieutenant colonel...

 of the United States Marine Corps

United States Marine Corps

The United States Marine Corps is a branch of the United States Armed Forces responsible for providing power projection from the sea, using the mobility of the United States Navy to deliver combined-arms task forces rapidly. It is one of seven uniformed services of the United States...

 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 Combat Engineer Battalion
  2nd Combat Engineer Battalion is a combat engineer battalion of the United States Marine Corps. They are based out of Marine Corps Base Camp Lejeune, North Carolina and fall under the command of the 2nd Marine Division and the II Marine Expeditionary Force....
  
  
• 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.

See also

• History of the United States Marine Corps
  History of the United States Marine Corps
  The history of the United States Marine Corps began with the founding of the Continental Marines on November 10, 1775 to conduct ship-to-ship fighting, provide shipboard security and discipline enforcement, and assist in landing forces. Its mission evolved with changing military doctrine and...
  
  
• List of United States Marine Corps regiments
• Organization of the United States Marine Corps
  Organization of the United States Marine Corps
  The United States Marine Corps is organized within the Department of the Navy, which is led by the Secretary of the Navy . The most senior Marine officer is the Commandant of the Marine Corps, responsible for organizing, recruiting, training, and equipping the Marine Corps so that it is ready for...