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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 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.
A Marine flys a Neros Archer first-person view drone on Camp Schwab, Okinawa, Japan, May 22, 2026.
U.S. Marines with III MEF share their perspectives on the professional, personal, and family benefits of serving in the Indo-Pacific.