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I Marine Expeditionary Force Profile
I Marine Expeditionary Force

@1stMEF

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The official X account of I MEF. Links, Likes, and RTs do not constitute endorsement.

Camp Pendleton, California
Joined May 2013
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@CMC_MarineCorps
Commandant of the @USMC
5 days
We opened the door and let Marines tell the story. Netflix’s MARINES shows LCpls, SNCOs, and junior officers in the fight, reminding the country that the ARG/MEU is our premier force offering, providing fast, flexible combat power from the sea. No DoW or USMC endorsement implied
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@1stMEF
I Marine Expeditionary Force
6 days
Blue-Green Integration: MWSS-372 fuels the joint force at Naval Aviation Warfighting Development Center 25.3 "This exercise wasn’t just great for the carrier air wing and the naval aviation enterprise. It was great for the joint force" #IMEF https://t.co/IqVHbArbzk
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imef.marines.mil
In a testament to joint force readiness and integration, U.S. Marines with Marine Wing Support Squadron 372, Marine Air Control Group 38, 3rd Marine Aircraft Wing, and U.S. Sailors with the Naval
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@1stMEF
I Marine Expeditionary Force
9 days
United States military deploys foreign disaster relief support for the philippine response to successive storms. "Support to our friends, allies, and partners, and their people in a time of need, is non-negotiable." #IMEF https://t.co/QvQxmxmcAE
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imef.marines.mil
At the request of the government of the Philippines, the U.S. military is working shoulder-to-shoulder with the Armed Forces of the Philippines to provide foreign disaster relief to communities
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@1stMEF
I Marine Expeditionary Force
16 days
Forging a stand-in force legacy “Above all, may the lessons gained and connections forged become springboards for future engagements as we move forward.” https://t.co/sEQ2TIvfrJ
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imef.marines.mil
U.S. Marines and Sailors with the Marine Rotational Force – Darwin (MRF-D) 25.3 Marine Air-Ground Task Force (MAGTF) and the Australian Defence Force (ADF) set a historic precedent this year for the
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@1stMEF
I Marine Expeditionary Force
20 days
“When the nation calls for muscle and moral clarity, it calls for I MEF.” - Gen (Ret.) James N. Mattis Founded on Nov. 10, 1775, the United States Marine Corps has served our nation honorably in every clime and place for 250 years. #250th #Marines #SemperFi
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@PacificMarines
Pacific Marines
1 month
- 🗺️ On the Ground: #PacificMarines with @1stMEF and the #PMC led simulated maritime strike operations from the Bilateral Coordination Center at Marine Base Camp Rodolfo, Philippines, Oct. 15, 2025. 📸: GySgt. Manuel A. Serrano | @USMC
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@VP
Vice President JD Vance
@VP
1 month
Vice President Vance to Marines at the 250th USMC anniversary celebration: “I realized I had a responsibility to something so much greater than myself. And I had an obligation to act on that feeling of duty.”
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@USNavy
U.S. Navy
1 month
From the sea comes the fight ⚓️ For 250 years, the Navy and @USMC have forged strength through training, tested resolve, and a shared will to win.
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@1stMEF
I Marine Expeditionary Force
1 month
From ship to shore - @USMC and @USNavy proved why America’s expeditionary force-in-readiness remains capable, credible, and lethal. #Marines250
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@USNavy
U.S. Navy
1 month
First to fight. Always together. ⚓️ From sea to shore, today’s demonstration showed the power, precision, and partnership of the Navy–Marine Corps Team.
@SECNAV
Secretary of the Navy John C. Phelan
1 month
Since Nov. 10, 1775, our Marines have been the ‘First to Fight’ From sea to shore, today’s Amphibious Capabilities Demonstration showcased @USMC power, precision and ability to win in any domain. When our nation dials 9-1-1, the Marines answer.
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@1stMEF
I Marine Expeditionary Force
1 month
I MEF is honored to showcase the heart of the Navy-Marine Corps team. Lethality isn’t a concept - it’s the @USMC
@SECNAV
Secretary of the Navy John C. Phelan
1 month
Since Nov. 10, 1775, our Marines have been the ‘First to Fight’ From sea to shore, today’s Amphibious Capabilities Demonstration showcased @USMC power, precision and ability to win in any domain. When our nation dials 9-1-1, the Marines answer.
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@1stMEF
I Marine Expeditionary Force
2 months
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@1stMEF
I Marine Expeditionary Force
2 months
Super Garuda Shield 25: MRF-D 25.3 Enables combined amphibious exercise Exercises like Super Garuda Shield 25 offer a glimpse of the new norm for the MRF-D MAGTF. #IMEF #MRFD https://t.co/9LFgrBT8Pe
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imef.marines.mil
During Exercise Super Garuda Shield 25, a detachment from 1st Air Naval Gunfire Liaison Company (ANGLICO), Marine Rotational Force — Darwin (MRF-D) 25.3, supported a multi-national amphibious exercise
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@1stMEF
I Marine Expeditionary Force
2 months
Driving momentum forward: I MEF and MCIWEST execute OCS III to enhance Marines' quality of life This iteration further concentrates time, tools, and trained teams on high-impact fixes in common areas and living spaces. #IMEF #MCIWest https://t.co/zsO9N5FkZS
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imef.marines.mil
I Marine Expeditionary Force and Marine Corps Installations West–Marine Corps Base Camp Pendleton launched Operation Clean Sweep III today, driving barracks improvements from across the Western region
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@1stMEF
I Marine Expeditionary Force
3 months
Thunderstruck: Marines compete in first ever service-wide communications team competition “The event attests to the whole-Marine concept — the ‘Marine communicator,’ not just the everyday communicator.” #USMC #Comms https://t.co/lfhauT9HHq
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imef.marines.mil
U.S. Marines from across the globe competed in the inaugural Thunderstruck Communications Team Competition, hosted by Marine Wing Communications Squadron 38, Marine Air Control Group 38, 3rd Marine
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@1stMEF
I Marine Expeditionary Force
3 months
I MEF Marines test drone systems in Defense Innovation Unit challenge “Events like these ensure our Marines will have the best available tools at their disposal in the next conflict.” #USMC #IMEF https://t.co/zXKkIRu8AZ
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imef.marines.mil
Marines with I Marine Expeditionary Force partnered with the Defense Innovation Unit and industry leaders during Phase 2 of the DIU’s G.I. Challenge, Aug. 18-29, 2025, to evaluate commercial small
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@1stMEF
I Marine Expeditionary Force
3 months
From the Philippines to Indonesia, MRF-D manuevers combat credible forces afloat "Exercise Alon, from planning to execution, showed the strength in partnership between three countries and their willingness to operate together.” #USMC #MRFD https://t.co/Vn0TIBUmJm
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imef.marines.mil
Within weeks of completing humanitarian assistance and disaster relief (HADR) operations in the Philippines, U.S. Marines and Sailors with the Marine Rotational Force – Darwin (MRF-D) 25.3 Marine
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@1stMEF
I Marine Expeditionary Force
3 months
Aircraft, HIMARS conduct joint land strike during Super Garuda Shield 25 “It is good developing our relationship with the United States and Australia, training reinforces readiness to keep the region safe.” #USMC #MRFD https://t.co/PpfRw8yvVU
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imef.marines.mil
The U.S. Army and Indonesian Armed Forces supported a multiday joint land strike with an Australian Joint Terminal Attack Controller (JTAC) underscoring continued partnership and interoperability at
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@USMC
U.S. Marines
3 months
#Marines and @USNavy #Sailors with 1st Marine Logistics Group participate in the Corpsmen Games on @MCIWPendletonCA. The games build unit cohesion, unit moral, and test the service members on their tactical combat casualty care abilities in stressful environments. #USMC
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