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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

U.S. Marines with Marine Air Control Squadron 4, Marine Air Control Group (MACG) 18, support command and control of aircraft at Andersen Air Force Base, Guam, June 13, 2022, in support of Valiant Shield 2022. Exercise Valiant Shield gives units like MACG-18 the opportunity to integrate with forces across the Indo-Pacific to train in successful employment and operations that demonstrate the strength and versatility of the Joint Force. (U.S. Marine Corps photo by Cpl. Tyler Harmon) - U.S. Marines with Marine Air Control Squadron 4, Marine Air Control Group (MACG) 18, support command and control of aircraft at Andersen Air Force Base, Guam, June 13, 2022, in support of Valiant Shield 2022. Exercise Valiant Shield gives units like MACG-18 the opportunity to integrate with forces across the Indo-Pacific to train in successful employment and operations that demonstrate the strength and versatility of the Joint Force. (U.S. Marine Corps photo by Cpl. Tyler Harmon)

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