Why It Matters

The Marine Corps is scaling back its original vision for a network of island-based strike forces across the Indo-Pacific, opting for two Marine Littoral Regiments instead of the three or more originally planned. A Congressional Research Service (CRS) report published June 25 details how operational lessons have reshaped the service's Marine Littoral Regiment (MLR) strategy, with implications for the U.S. military's efforts to deter China and operate in contested maritime environments.

The Big Picture

The Marines originally planned to establish at least three MLRs as part of a broader redesign emphasizing naval expeditionary warfare. These regiments were conceived as "stand-in forces" positioned on islands, coastlines, and observation posts to surveil chokepoints, detect adversary movements, and hold enemy naval forces at risk from shore using systems such as the Naval Strike Missile mounted on Joint Light Tactical Vehicles. The strategy also calls for MLRs to help counter "grey zone" activities, coercive measures short of open conflict that adversaries could use against U.S. allies and partners.

Through what the Marines termed their "Campaign of Learning," the service concluded that two MLRs plus one reinforced Marine Infantry Regiment represent the optimal force composition for III Marine Expeditionary Force (MEF), rather than the three MLRs originally envisioned. The planned 4th MLR on Guam was canceled, with the 4th Marine Regiment instead remaining a reinforced Marine Infantry Regiment. The 1st Battalion, 4th Marines held a redesignation ceremony at Camp Pendleton on Jan. 10, 2025, marking its planned incorporation into the 12th MLR.

The Ground/Air Task Oriented Radar (G/ATOR), a three-dimensional expeditionary sensor capable of detecting rockets, artillery, mortars, cruise missiles, and manned and unmanned aircraft, is now operational, according to May 19 testimony before the Senate Armed Services Committee.

The Navy abandoned its original acquisition approach for the Landing Ship Medium (LSM) in late 2024 after industry bids came in higher than expected. The service is now pursuing a proven, non-developmental vessel as the first phase of LSM procurement. The current fiscal year budget request calls for $1.89 billion to procure six LSMs.

The Bottom Line

With fewer MLRs but increasingly capable sensors, anti-ship weapons, and other systems, the Marine Corps is concentrating its Indo-Pacific force structure around two specialized littoral regiments and a reinforced infantry regiment. The shift reflects the service's conclusion that this smaller force composition is better suited to III MEF's missions and objectives while preserving forces that can be reorganized to respond to crises and conflicts.

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