I Marine Expeditionary Force
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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. 


1st Marine Logistics Group Campaign Order LOE:1 Warfighting Capability
1st Marine Logistics Group
Jan. 10, 2022 | 0:53
1st Marine Logistics Group Campaign Order LOE:1 Warfighting Capability
1st Marine Logistics Group
Jan. 10, 2022 | 0:53
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1st Marine Logistics Group Campaign Order LOE:1 Warfighting Capability
1st Marine Logistics Group Campaign Order Announcement
Steel Knight 22
LEON Platoon Conducts Littoral Dive Missions
1st LAR Unitas 2021
3/4 Always Training Always Ready
Resilience Seminar
An EOTG Series: Boat Raid Course
I MIG Marines attend Innovation Bootcamp
Red Patch
13th MEU UET
7th Engineer Support Battalion Squad Competition
7th Engineer Support Battalion Squad Competition
11th Marines FIREX: The King of Battle
Mechanized Raid Course
Recon Ex: Working Hand in Hand
Super Squad 21
1st Medical Battalion En Route Care
1st LSB Conducts Parachute Operations
Why I Reenlisted: Sgt. Asia Schmitz
Chapter 3: Readiness
Covid-19 Q&A with CDR Gilstrap
Introduction to Super Squad 21
Introduction to Super Squad 21
Career Retention Commanding Generals Delegation of Authority
U.S. Marines Conduct Air Delivery Operations
An EOTG Series: TRAP Course
Vaccines Still Prevent The Spread Of COVID-19
Message to the Brigade of Midshipmen from 1st MARDIV
Covid Vaccine and the Second Shot
35XX First-Term Reenlistment Incentives
Range 800 Opening
Vaccines Can Protect Against the Delta Variant
Why I Reenlisted - Cpl. Smith
Super Squad 21 Teaser
1st Marine Division Band Performs "Waltzing Matilda"
I MIG Change of Command
How to Schedule a “Shot Ex”
Why We Chose To Vaccinate Our Children
1/5 Return to Water Operations Part 1: Crawl
Return to water operations
1/5 Return to Water Operations Part 1: Crawl
Vaccine Benefits: What's In It For Me?
En Route Care
Like Father, Like Son: Sgt. Trevon Wade
Like Father, Like Son: MGySgt (Ret.) Steve Payne
Like Father, Like Son: 1st Lt. Stefawn Payne
Photo Information

Marines with Battery I, 3rd Battalion, 11th Marine Regiment, 1st Marine Division, fire an M777 Howitzer¬ during the opening day of live-fire operations for Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, California, on Dec. 10, 2015. The tough, realistic training is intended to develop combat skills necessary to operate as the ground combat element of the I Marine Expeditionary Force.

Photo by Sgt. Cameron Storm

Artillery launches Steel Knight at MCAGCC

11 Dec 2015 | Sgt. Justin Boling Defense Media Activity

The opening fires of the 1st Marine Division’s Exercise Steel Knight commenced at Marine Corps Air Ground Combat Center Twentynine Palms, Calif. Dec. 10, 2015 with shouts of artillerymen, the yank of a chord and the satisfying decimation of targets.

“We are shooting in support of [1st Light Armored Reconnaissance Battalion and 1st Tank Battalion],” said Sgt. Kenyum Scott, an artillerymen with Battery I, 3rd Battalion, 11th Marine Regiment. “We would normally be out here shooting by ourselves; now we are shooting for other Marines to advance on to their objectives.”

The two-week-long exercise allows units, like the battery, to work alongside thousands of Marines and sailors of different occupations to reinforce the Marine Air Ground Task Force concept and instill confidence in the units’ ability to work in a combined arms effort. 

“After we finish with this shoot, we have one movement day to get our next location,” said Cpl. Levin Jolley, artilleryman with the unit. “Then we set up and wait for call for fires.”

Teams of Marines with the battery manned their M777 Howitzers to engage targets to allow other units of 1st Marine Division to begin their movement toward one of their assault objectives. 

“Operating the guns can present some obstacles,” said Cpl. Levin Jolley, an artilleryman with Battery I. “Sometimes it can be difficult to set the gun deflection. We overcame this by pumping up the gun to that direction.”

The exercise is designed to challenge Marines and sailors from numerous occupational fields found throughout the 1st Marine Division. The skills of these men and women keep the division a multi-role, expeditionary ground combat force ready to answer the call whenever or wherever it may be.

“Maintenance and keeping up the guns can be an obstacle when maintaining fires,” Scott said. “You have to find out what is wrong and fix it or trouble shoot to get it firing again.”

The battery will continue to support the infantrymen, tank operators and other Marines advancing to the final objective of Exercise Steel Knight.

I MEF Leaders

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

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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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Sgt. Maj. Terrence C. Whitcomb
Sergeant Major, I Marine Expeditionary Force

Sergeant Major Whitcomb began Marine Corps Recruit Training on 14 September 1993 at Marine Corps Recruit Depot, San Diego, California with Company C, 1st Recruit Training Battalion.  He was meritoriously promoted to Private First Class and graduated Recruit Training on 10 December 1993. Following graduation from Recruit Training, Private First

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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