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


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. 


Exercise Croix du Sud 2023
1st Marine Logistics Group
May 6, 2023 | 1:43
Exercise Croix du Sud 2023
1st Marine Logistics Group
May 6, 2023 | 1:43
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Exercise Croix du Sud 2023
MRF-D and ADF medical teams participate in combat care exercise
Recon Marines, Indonesian Korps Marinir participate in annual reconnaissance exercise
Hub, Spoke, Node: Delivering Combat Power Any Time, Any Place
11th MEU annual gas chamber
11th MEU Dine Out
13th MEU Cobra Gold 23 Non-Combatant Evacuation Operation
Fueled to Fight – CLR-17 Final Field Mess Evaluation
Year in Review: Celebrating 82 years of the Blue Diamond
VMM-161 Trains for Expeditionary Advanced Base Operations in the Bahamas
Faces of the Blue Diamond: Staff Sgt. Jessica Larsen
Reel: U.S. Marines breach, clear buildings
EOTG | Raid Leaders Course
On the Drums at the Rose Parade
Teaser: I MEF, ESG-3 conclude Exercise Steel Knight 23
Influenced on the court: basketball leads to a career in the Marines
CLR-1 Participates in the First Ever Mental Fitness Obstacle Course
I MEF: Any Clime, Any Place
CLR-17 Field Mess Evaluation
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
Marines test deployment capabilities as part of REDEX
Red Ex: Australia Edition
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
Photo Information

U.S. Marine Corps Lt. Gen. George W. Smith, commanding general of I Marine Expeditionary Force (I MEF), arrives in Darwin during his visit of Marine Rotational Force-Darwin (MRF-D) 22 at Royal Australian Air Force Base Darwin, NT, Australia, June 7, 2022. I MEF leadership visited Darwin, Australia to better understand MRF-D 22’s capabilities and their operating environment. (U.S. Marine Corps photo by Staff Sgt. Antonio De La Fuente)

Photo by Staff Sgt. Antonio De La Fuente

I MEF CG Visits Darwin to Reinforce MRF-D’s Movement Forward

22 Jun 2022 | Capt. Joseph DiPietro Marine Rotational Force - Darwin

DARWIN, AUSTRALIA. – Lieutenant General George Smith, Commanding General of I Marine Expeditionary Force (MEF), visited the Marine Rotational Force-Darwin (MRF-D) on June 7 - 8.

“The MAGTF is doing a great job of training alongside the ADF, and has been for years,” said General Smith, who leads the Southern California-based MEF. “MRF-D is dead center of the largest MAGTF in the Marine Corps.”

After ten years of Marine Corps rotations through the Northern Territory, I MEF now serves as the higher headquarters for the MRF-D, and will continue to provide the balance of Marines and Sailors in the coming years. Like the 2022 rotation, I MEF will continue to send standing regimental headquarters to serve as the MAGTF’s command element. This change, as well as several other refinements to the deployed force structure, increased the ability of MRF-D to integrate with the Australian Defence Force (ADF), and other shared regional partners.

“The transition was noticeable from the start of this year's rotation," said Headquarters Northern Command Commanding Officer Colonel Marcus Constable, the senior Australian leader responsible for coordination between the ADF and MRF-D. “In years' past, MRF-D took a few months to come together before reaching a fully capable status. This year, MRF-D 22 arrived more capable of training alongside ADF forces and in more complex environments and scenarios.”

MRF-D is, and must continue to be postured to facilitate operations from humanitarian assistance to high-intensity combat in the region, in support of our allied and partnered nations. A large part of that readiness is nested within the training environment here in the Northern Territory and relationship with the ADF, particularly with 1st Brigade.

“Australia provides one of the best training environments I’ve seen, and the close partnership we have with our ADF hosts has already yielded noticeable results in terms of our ability operate alongside on another,” said Colonel Chris Steele, the MRF-D 22 commanding officer and leader of MRF-D’s transition forward. “The MAGTF arrived well-trained and eager to learn, and I’ve been impressed with the aggressive bilateral training I’ve seen to date. This training is how we increase our combined USMC-ADF warfighting proficiency – by working through how to solve the toughest battlefield problems, together. We were prepared to respond to crisis or contingency yesterday, we’re better prepared today.”

In preparation for MRF-D 22, elements of the MRF-D MAGTF participated in 1st Marine Division’s premier exercise, STEEL KNIGHT. This exercise allowed the team to work through a range of mission rehearsals together, and improve its ability to integrate all elements of the force in support of Expeditionary Advanced Base Operations.

“There is a clear recognition of the power of a cohesive MAGTF,” emphasized General Smith to the MRF-D 22 command team. “You are propelling the Marine Corps forward.”

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 and began recruit training in April 1993 aboard Marine Corps Recruit Depot San Diego, California. Upon graduation, he was meritoriously promoted to the rank of Lance Corporal and continued to Marine Combat Training aboard Camp Pendleton, California, and Personnel Administration School

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CMDCM(FMF/SW/AW/IW) Charles F. Ziervogel
Command Master Chief

Master Chief Ziervogel enlisted in the Navy in August of 1989. Following Basic Training in Orlando, Florida he successfully completed the Navy Nuclear Power Training Pipeline. From October 1991 to December 1996 he served as a member of Reactor Control Division onboard USS Nebraska (SSBN 739 Gold) through New Construction and Commissioning,

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I Marine Expeditionary Force