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A U.S. Marine Corps medium tactical vehicle replacement with Aviation Command and Control Detachment, Marine Rotational Force – Southeast Asia, I Marine Expeditionary Force, tows an AN/TPS-80 Ground and Air Task Oriented Radar during training in the Philippines, Aug. 17, 2026. - A U.S. Marine Corps medium tactical vehicle replacement with Aviation Command and Control Detachment, Marine Rotational Force – Southeast Asia, I Marine Expeditionary Force, tows an AN/TPS-80 Ground and Air Task Oriented Radar during training in the Philippines, Aug. 17, 2026. The training supports the Philippine Marine Corps’ Archipelagic Coastal Defense Concept and provides U.S. and Philippine forces opportunities to refine fires integration while testing capabilities that improve command and control and enhance fires integration. MRF-SEA serves as I MEF’s forward command element in the Philippines, supporting Task Force-Philippines and integrating with the Armed Forces of the Philippines to strengthen interoperability and improve combined readiness. (U.S. Marine Corps photo by Cpl. Ryan Ramsammy)

U.S. Marines with Marine Rotational Force-Southeast Asia, I Marine Expeditionary Force, and Indonesian marines with 10th Marine Infantry Battalion, Indonesian Korps Marinir, stand in formation during the Keris Marine Exercise (MAREX) 2024 Opening Ceremony at Yonif 10 Marinir, Batam, Indonesia, Nov. 6, 2024. Keris MAREX is a bilateral exercise conducted by the U.S. Marine Corps and Korps Marinir Republik Indonesia, or Indonesian Marine Corps, to strengthen relationships as military partners and increase interoperability among participating forces in the advancement of a Free and Open Indo-Pacific. MRF-SEA is a rotational unit derived from elements of I Marine Expeditionary Force executing a U.S. Marine Corps Forces, Pacific operational model that involves training events and exchanges with partner military subject matter experts, promotes security goals with Allied and partner nations, and ensures a persistent I MEF presence west of the International Date Line. (U.S. Marine Corps photo by Sgt. Shaina Jupiter) - U.S. Marines with Marine Rotational Force-Southeast Asia, I Marine Expeditionary Force, and Indonesian marines with 10th Marine Infantry Battalion, Indonesian Korps Marinir, stand in formation during the Keris Marine Exercise (MAREX) 2024 Opening Ceremony at Yonif 10 Marinir, Batam, Indonesia, Nov. 6, 2024. Keris MAREX is a bilateral exercise conducted by the U.S. Marine Corps and Korps Marinir Republik Indonesia, or Indonesian Marine Corps, to strengthen relationships as military partners and increase interoperability among participating forces in the advancement of a Free and Open Indo-Pacific. MRF-SEA is a rotational unit derived from elements of I Marine Expeditionary Force executing a U.S. Marine Corps Forces, Pacific operational model that involves training events and exchanges with partner military subject matter experts, promotes security goals with Allied and partner nations, and ensures a persistent I MEF presence west of the International Date Line. (U.S. Marine Corps photo by Sgt. Shaina Jupiter)