I Marine Expeditionary Force

From Wikipedia, the free encyclopedia
I Marine Expeditionary Force
I MEF insignia
Active 8 November 1969 – present
Country  United States of America
Branch  United States Marine Corps
Type Marine Air-Ground Task Force
Role Expeditionary combat force
Part of U.S. Marine Forces Pacific
Garrison/HQ MCB Camp Pendleton, California, U.S.

Persian Gulf War

Global War on Terrorism

Iraq War

LtGen L. A. Craparotta, USMC
Gen Joseph F. Dunford, Jr., Gen Anthony Zinni, Gen Michael Hagee, Gen James T. Conway, Gen James Mattis, Gen John F. Sattler

The I Marine Expeditionary Force ("I" pronounced "One") is a Marine Air Ground Task Force (MAGTF) of the United States Marine Corps primarily composed of the 1st Marine Division, 3rd Marine Aircraft Wing, and 1st Marine Logistics Group. It is based at Marine Corps Base Camp Pendleton.

I Marine Expeditionary Force is the largest of the three MEFs in the Fleet Marine Force and is often referred to as the "Warfighting MEF" for its consistent involvement and contributions in major armed conflicts.


Pronunciation of the Roman numeral designator: As a Roman numeral the capital letter "I", representing one (1), is properly pronounced as "One." However, there are some who erroneously pronounce the number as either "First," or either intentionally, or unknowingly, pronounce it as "Eye," as in the letter "I."

The convention of using Roman numerals to designate a MEF, which is itself the Marine Corps equivalent organization to an Army corps, stems from the U.S. Army practice that began in the American Civil War, and continues today, of numbering corps (two or more divisions with supporting troops, and sometimes including separate brigades, regiments, groups, or battalions, all under a unified corps headquarters, usually commanded by a lieutenant general) with Roman numerals. Corps, themselves being the first-level sub-unit of a "field army," or a numbered, or named, army (e.g., First U.S. Army, or the Army of the Potomac).

During the First World War, the 4th Marine Brigade, as part of the U.S. Army 2nd Infantry Division, came under the U.S. Army I Corps, American Expeditionary Forces. With the expansion of the Marine Corps to six divisions and five air wings during the Second World War, the Marine Corps created two "Amphibious Corps," I Marine Amphibious Corps (later re-designated as III Amphibious Corps) and V Amphibious Corps, continuing the custom began by the Army. Modern Marine Expeditionary Forces, or MEFs (for a time known as Marine Amphibious [italics added] Forces, or MABs) continue the U.S. Marine Corps legacy as corps-equivalent organizations designated by Roman numerals.


When directed, I MEF deploys and is employed as a Marine Air Ground Task Force (MAGTF) in support of Combatant Commander (COCOM) requirements for contingency response or Major Theater War; with appropriate augmentation, serves as the core element of a Joint Task Force (JTF); prepares and deploys combat ready MAGTF’s to support COCOM presence and crisis response; and supports service and COCOM initiatives as required.


  • Activated on 8 November 1969 at Okinawa, Japan as the I Marine Expeditionary Force
  • Redesignated on 18 August 1970 as the I Marine Amphibious Force (I MAF)
  • Relocated in April 1971 to Camp Pendleton, California
  • Redesignated on 5 February 1988 as the "I Marine Expeditionary Force"


Structure of I MEF (Outdated)


Recent service


  1. ^ Reynolds Baghdad, Basrah and Beyond, pg. 169.

External links

  • I MEF official website
Retrieved from "https://en.wikipedia.org/w/index.php?title=I_Marine_Expeditionary_Force&oldid=825468237"
This content was retrieved from Wikipedia : http://en.wikipedia.org/wiki/I_Marine_Expeditionary_Force
This page is based on the copyrighted Wikipedia article "I Marine Expeditionary Force"; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA