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I Marine Expeditionary Force
I MEF Logo
Ready. Engaged. Faithful.
Official U.S. Marine Corps Website

Mission

I MEF provides the Marine Corps a globally responsive, expeditionary, and fully scalable Marine Air-Ground Task Force (MAGTF), capable of generating, deploying, and employing ready forces and formations for crisis response, forward presence, major combat operations, and campaigns. 

 

Influenced on the court: basketball leads to a career in the Marines
I MEF Information Group
Nov. 7, 2022 | 1:51
Influenced on the court: basketball leads to a career in the Marines
I MEF Information Group
Nov. 7, 2022 | 1:51
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Influenced on the court: basketball leads to a career in the Marines
CLR-17 Field Mess Evaluation
I MEF: Any Clime, Any Place
1st Bn., 7th Marines conducts battalion field exercise
U.S. Marines participate in ceremony to mark 80th anniversary of Battle of Guadalcanal
Summer Fury 22: HMLA-267
80 years later, Marine remembers Guadalcanal
Red Ex: Australia Edition
Marines test deployment capabilities as part of REDEX
MRF-D 22: Darrandarra
MRF-D 22: U.S. Marines, Australian Army, and Japan Ground Self-Defence Force Personnel Participate in Exercise Southern Jackaroo
MRF-D 22: We're Gonna Get You out of Here
Exercise Garnet Rattler Teaser
Exercise Crocodile Response: Helping Hands
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Category: 1stMARDIV
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MARINE CORPS BASE CAMP PENDLETON, Calif. - Staff Sgt. Albert Macklin, a battery local security chief with Battery Q, 5th Battalion, 11th Marine Regiment, I Marine Expeditionary Force and New Orleans native, helps coordinate 360-degree security during Spring Fire Exercise at Camp Pendleton March 31, 2016. During the combined-arms training exercise, Macklin and other Marines helped coordinate where all security posts were, along with securing the various parts of the range in accordance with where the battery was firing. (U.S. Marine Corps Photo by Cpl. Demetrius Morgan/RELEASED) - MARINE CORPS BASE CAMP PENDLETON, Calif. - Staff Sgt. Albert Macklin, a battery local security chief with Battery Q, 5th Battalion, 11th Marine Regiment, I Marine Expeditionary Force and New Orleans native, helps coordinate 360-degree security during Spring Fire Exercise at Camp Pendleton March 31, 2016. During the combined-arms training exercise, Macklin and other Marines helped coordinate where all security posts were, along with securing the various parts of the range in accordance with where the battery was firing. (U.S. Marine Corps Photo by Cpl. Demetrius Morgan/RELEASED)

Cpl. Nathaniel Asoau, Light Armored Vehicle crewman with Company D., 1st Light Armored Reconnaissance Battalion and student with the Urban Leaders Course, provides covering fire from behind a barricade while his partner, Lance Cpl. Leonardo Perez, drops to a prone position during a combat marksmanship program range at Marine Corps Base Camp Pendleton, California, March 31, 2016. This range is the first live-fire range of the three-week course and is designed to hone Marines’ combat marksmanship skills including how to shoot, move and communicate with a buddy. - Cpl. Nathaniel Asoau, Light Armored Vehicle crewman with Company D., 1st Light Armored Reconnaissance Battalion and student with the Urban Leaders Course, provides covering fire from behind a barricade while his partner, Lance Cpl. Leonardo Perez, drops to a prone position during a combat marksmanship program range at Marine Corps Base Camp Pendleton, California, March 31, 2016. This range is the first live-fire range of the three-week course and is designed to hone Marines’ combat marksmanship skills including how to shoot, move and communicate with a buddy.

Marines coordinate fires for High Mobility Artillery Rocket System during an M142 HIMARS live fire exercise at Camp Pendleton March 16, 2016. During the exercise, Marines coordinated fires based on hypothetical combat situations they might encounter while deployed. The HIMARS rounds are aided by Global Positioning System (GPS) technology and can travel to altitudes up to 75 kilometers and can precisely engage targets up to 40 miles away. The Marines are with Battery S, 5th Battalion, 11th Marine Regiment, 1st Marine Division, I Marine Expeditionary Force. - Marines coordinate fires for High Mobility Artillery Rocket System during an M142 HIMARS live fire exercise at Camp Pendleton March 16, 2016. During the exercise, Marines coordinated fires based on hypothetical combat situations they might encounter while deployed. The HIMARS rounds are aided by Global Positioning System (GPS) technology and can travel to altitudes up to 75 kilometers and can precisely engage targets up to 40 miles away. The Marines are with Battery S, 5th Battalion, 11th Marine Regiment, 1st Marine Division, I Marine Expeditionary Force.

I MEF Leaders

Lt. Gen. George W. Smith Jr.
Commanding General, I Marine Expeditionary Force

Lieutenant General Smith was commissioned through the NROTC program at the University of North Carolina at Chapel Hill in May 1985. A career infantry officer, his assignments in the operating forces include Rifle Platoon Commander and 81mm Mortar Platoon Commander in 2d Battalion, 1st Marines; Logistics Officer and Rifle Company Commander in 1st Battalion, 3d Marines; and Commanding Officer, 1st Force Reconnaissance Company, during which he deployed twice in support of Operation Iraqi Freedom.

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Brig. Gen. Ryan S. “Chick” Rideout
Deputy Commanding General, I Marine Expeditionary Force

Brigadier General Rideout assumed duties as Deputy Commanding General, I Marine Expeditionary Force in July 2021. His previous assignment was serving as Director, Military Advisor Group, Combined Joint Task Force - Operation INHERENT RESOLVE based in Baghdad, Iraq from June of 2020 to June 2021. Fleet Marine Force assignments include: Commanding

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Colonel Brian Rideout
Chief of Staff, I Marine Expeditionary Force

Colonel Rideout holds a baccalaureate degree in Psychology from Ohio Wesleyan University, a Master of Science in Information Technology Management from the Naval Postgraduate School, a Master of Military Studies from Marine Corps University and a Master of Arts in National Security and Strategic Studies from the Naval War College.  He is a graduate

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Sergeant Major Peter A. Siaw
Command Senior Enlisted Leader, I Marine Expeditionary Force

Sergeant Major Peter A. Siaw was born in Chicago, Illinois.  He reported to Marine Corps Recruit Depot (MCRD) San Diego, California in April 1993 for recruit training. He subsequently completed Marine Combat Training at Camp Pendleton, California, and Personnel Administration School at Camp Lejeune, North Carolina.  He has attended all required

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CMDCM(FMF/SW/AW/IW) Toby A. Ruiz
Command Master Chief

 Though a native of Montebello, California, Master Chief Ruiz calls Monte Vista, Colorado home.  He enlisted in the Navy in March 1991, reported to basic training at RTC Great Lakes, Illinois and completed Signalman “A” School at NTC Orlando, Florida.  After serving two tours as a collateral-duty Command Career Counselor in 2000 and 2003, he became

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I Marine Expeditionary Force