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III MARINE EXPEDITIONARY FORCE

III MEF Logo
FORWARD. FAITHFUL. FOCUSED.
Okinawa, Japan

Who we are

III MEF is the nucleus of a joint and coalition Stand-In Force within the First Island Chain. In competition, III MEF assures and expands access for the joint force across the Indo-Pacific. In crisis, it provides in-place response forces to secure allies and partners while deterring adversary aggression. In conflict, III MEF fights from advanced naval bases as part of a naval expeditionary force and enables Joint Force objectives in the Indo-Pacific.


 

01

MWSS 174 | Toxic Swell 25

U.S. Marine Corps PFC. Noah Carver with MWSS-174, scans an aircraft for contaminates during exercise Toxic Swell 25.

02

31st MEU | VMFA 242

U.S. Marine Corps F-35B Lightning II aircraft assigned to Marine Fighter Attack Squadron 242, fly over the USS America with 31st MEU.

03

31st MEU | Anti-Submarine

A U.S. Marine Corps MV-22B Osprey assigned to Marine Medium Tiltrotor Squadron 265, departs the USS George Washington with the 31st MEU.

04

HMLA-169 | Live Fire Maneuvers

U.S. Marine Corps Sgt. Ethan Cox, a crew chief with Marine Light Attack Helicopter 169 fires a GAU-21 machine gun during a live fire exercise.

05

HMLA-169 | Light Attack Power

UH-1Y Venom and AH-1Z Viper helicopters with Marine Light Attack Helicopter Squadron 169, fly off the coast of Okinawa, Japan, July 19, 2025.

06

3d DIV | Search and Recovery

3d Reconnaissance Battalion Marines dive during a search and recovery drill on Camp Schwab, Okinawa, Japan, July 15, 2025.

 

Featured News

Dear Valley View
31st Marine Expeditionary Unit
Jan. 14, 2021 | 1:22
Dear Valley View
31st Marine Expeditionary Unit
Jan. 14, 2021 | 1:22
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Dear Valley View
3D Marine Division COMMSTRAT conduct physical training
VMGR-152 Marines train during exercise Red-Flag Alaska
MWSS-172 Marines refuel HMLA-169 aircraft
Force Reconnaissance Company Silent Jungle Patrol
3d Intelligence Battalion conducts ground sensor operations
U.S. and ROK Marines conduct dry close air support exercise  (REEL)
3d Marine Division Conducts Change of Command Ceremony
Basic Skills: 1st Lt. Jeffery Homan interview
U.S. service members conduct close-quarters battle training
31st MEU | MV-22B aerial shoots during Talisman Sabre 25
The role of III Marine Expeditionary Force Information Group in modern warfare
31st MEU | Integrated Training in the Indo-Pacific
31 Seconds with 31st MEU | VMFA-242 82nd Birthday
VMFA-214 and MWCS-18 collaborate with 3d MARDIV JTAC in CAS training
 
III Marine Expeditionary Force