U.S. Deploys Boxer Amphibious Ready Group with 4,000 Marines for Potential Gulf Operations Against Iran.

The United States advanced the deployment of USS Boxer and the 11th Marine Expeditionary Unit to the Middle East on March 20, 2026. The move strengthens rapid-response and amphibious strike options as tensions with Iran threaten maritime security in the Strait of Hormuz.

Departing San Diego roughly three weeks ahead of schedule, the Boxer Amphibious Ready Group carries Marines, aviation assets, and surface connectors capable of expeditionary assault and crisis evacuation. The deployment aligns with escalating harassment of commercial shipping and signals a forward-positioned force prepared for contingency operations under what officials describe as Operation Epic Fury. While mission specifics remain undisclosed, the force package suggests readiness for both deterrence and rapid combat insertion.

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The USS Boxer belongs to the Wasp class amphibious assault ships, designed to project Marine Corps power ashore without reliance on established ports. Displacing around 40,500 tons at full load and measuring over 250 meters in length, the ship can carry a mix of rotary-wing aircraft and short take-off and vertical landing jets such as the F-35B Lightning II, alongside landing craft deployed from its well deck. Its aviation component is supported by a flight deck equipped to handle simultaneous helicopter operations, while internal command facilities enable it to function as a forward command node for joint operations.

The Boxer Amphibious Ready Group also includes the San Antonio class amphibious transport dock USS Portland and the Whidbey Island class dock landing ship USS Comstock. The USS Portland, as a San Antonio class ship, integrates advanced command, control, communications, computers, intelligence, surveillance and reconnaissance systems, allowing it to coordinate distributed landing forces and manage complex littoral operations. The USS Comstock, for its part, specializes in deploying landing craft air cushion and mechanized units, providing the logistical backbone required for sustained amphibious maneuver.

Embarked aboard these vessels, the 11th Marine Expeditionary Unit represents a self-contained force of approximately 2,500 personnel. A Marine Expeditionary Unit (MEU) combines a reinforced infantry battalion, a composite aviation squadron, and a logistics combat element, enabling it to conduct operations ranging from non-combatant evacuation to high-intensity amphibious assaults. Its aviation component typically includes MV-22B Osprey tiltrotor aircraft, which offer a combat radius exceeding 700 kilometers and allow rapid insertion of troops deep inland, as well as AH-1Z attack helicopters capable of precision fires using Hellfire missiles and guided rockets.

This deployment follows closely the movement of another amphibious formation centered on the USS Tripoli and elements of the 31st Marine Expeditionary Unit, suggesting a deliberate concentration of amphibious capabilities in the region. In parallel, U.S. naval aviation assets, including the MQ-4C Triton high-altitude long-endurance unmanned aerial vehicle, conduct surveillance missions over the northern Persian Gulf. The MQ-4C Triton (Multi-Function Maritime Surveillance Aircraft MQ-4C) operates at altitudes above 50,000 feet with endurance exceeding 24 hours, carrying a multi-function active sensor radar capable of wide-area maritime surveillance and detection of surface contacts across thousands of square kilometers.

Although official statements remain limited, the timing and scale of these movements align with discussions within the U.S. administration regarding options to pressure Iran, including a potential blockade or seizure of Kharg Island, a critical node for Iranian oil exports. The island’s proximity to the mainland, roughly 30 kilometers, places any deployed force within range of Iranian coastal defenses, including anti-ship cruise missiles and short-range ballistic systems.

From a tactical perspective, the presence of two Amphibious Ready Groups enhances the U.S. military’s ability to conduct distributed amphibious operations under contested conditions. The combination of sea-based aviation, vertical lift, and surface assault craft enables forces to bypass heavily defended shorelines and project combat power at multiple points simultaneously. Moreover, the integration of ISR assets such as the MQ-4C Triton supports persistent situational awareness, allowing commanders to track maritime traffic, detect asymmetric threats such as uncrewed surface vessels, and adjust force posture in near real time. However, operating in the confined waters of the Persian Gulf imposes constraints, as amphibious ships remain vulnerable to saturation attacks and require layered air and missile defense to ensure survivability.

The broader implications of this deployment extend beyond immediate military considerations. The concentration of U.S. amphibious forces near the Strait of Hormuz signals a willingness to escalate pressure on Iran at a time when global energy markets remain highly sensitive to disruptions in oil flows. If a blockade or seizure of Kharg Island were pursued, the move would likely trigger retaliatory actions and further destabilize maritime security in the Gulf. At the same time, the forward positioning of Marine Expeditionary Units reinforces U.S. commitments to regional allies, including Gulf states reliant on secure sea lines of communication. In this context, the deployment reflects both a tactical adjustment to evolving threats and a strategic message aimed at shaping the balance of power in one of the world’s most critical maritime chokepoints.

Written By Erwan Halna du Fretay - Defense Analyst, Army Recognition Group
Erwan Halna du Fretay holds a Master’s degree in International Relations and has experience studying conflicts and global arms transfers. His research interests lie in security and strategic studies, particularly the dynamics of the defense industry, the evolution of military technologies, and the strategic transformation of armed forces.