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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.
A Marine sights in with an M27 infantry automatic rifle during a force-on-force raid at Combined Arms Training Center Camp Fuji, Japan, July 16, 2026.
A Marine inspects a NMESIS during maritime key terrain security operations in support of KAMANDAG 10 at Batanes Islands, Philippines, June 26, 2026.
A KC-130J Super Hercules aircraft refuels an F-35B Lightning II aircraft in support of Valiant Shield 2026 over the Pacific Ocean, June 25, 2026.
A Tactical Resupply Unmanned Aircraft System takes flight before RD 26 at JGSDF Hijudai Maneuver Area, Oita Prefecture, Japan, June 18, 2026.
U.S. Marine Corps engages targets during a short-bay live-fire range at Camp Hansen, Okinawa, Japan, June 11, 2026.
U.S. Marines with III MEF share their perspectives on the professional, personal, and family benefits of serving in the Indo-Pacific.