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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 U.S. Marine with 12th LCT, sets security during a combat trauma management course evaluation on Camp Courtney, Okinawa, Japan, Aug. 27, 2026.
A Marine programs half-quick for JTAC operations during routine training at le-Shima, Okinawa, Japan, Aug. 20, 2026.
U.S. Marines establish a simulated expeditionary airfield landing zone at Marine Corps Air Station Kaneohe Bay, Hawaii, Aug. 10, 2026.
Marines with 12th MLR maneuver a Navy-Marine Expeditionary Ship Interdiction System on Camp Hansen, Okinawa, Japan, July 7, 2026.
A Marine returning from deployment with the 31st Marine Expeditionary Unit embraces his family at Camp Hansen, Okinawa, Japan, July 22, 2026.
U.S. Marines with III MEF share their perspectives on the professional, personal, and family benefits of serving in the Indo-Pacific.