Marine Corps MV-22B Deploys as ASW Platform to Fight an Increasing Submarine Threat

MV-22B
U.S. Marine Corps Cpl. Tristan Courtney, a crew chief with Marine Medium Tiltrotor Squadron (VMM) 265 (Rein.), 31st Marine Expeditionary Unit, deploys buoys during anti-submarine warfare operations, in the Philippine Sea, Aug. 8, 2025. The Marines conducted the operation utilizing buoys to detect underwater acoustics for ships and submarines in order to increase U.S. naval forces capabilities to detect and deter in the undersea domain. (U.S. Marine Corps photo by Cpl. Alora Finigan)
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The U.S. Marine Corps performed its first Indo-Pacific anti-submarine warfare operations off the deck of USS George Washington (CVN 73) and USS America (LHA 6), an important test that validates long-range Osprey tiltrotor aircraft in the anti-submarine mission set. The addition of the MV-22B as an anti-submarine warfare platform allows for farther reach compared to Navy MH-60Rs that currently perform anti-submarine warfare work from deployed ships.

The test, which took place in the Philippine Sea, paired a Marine Corps MV-22B with two Navy MH-60R Seahawks, part of a larger America ESG and George Washington CSG team.

A U.S. Marine Corps MV-22B Osprey assigned to Marine Medium Tiltrotor Squadron (VMM) 265 (Rein.), 31st Marine Expeditionary Unit, supports anti-submarine warfare operations, in the Philippine Sea, Aug. 8, 2025. The Marines conducted the operation utilizing buoys to detect underwater acoustics for ships and submarines in order to increase U.S. naval forces capabilities to detect and deter in the undersea domain. The 31st MEU is operating aboard ships of the USS America Amphibious Ready Group in the 7th Fleet area of operations, the U.S. Navyโ€™s largest forward-deployed numbered fleet, and routinely interacts and operates with allies and partners in preserving a free and open Indo-Pacific region. (U.S. Marine Corps photo by Cpl. Alora Finigan)

โ€œThe Marine Corps has spent the past five years re tooling to fight in the Pacific and the submarine threat canโ€™t be ignored. The MV-22B complements the Navyโ€™s capabilities so well that itโ€™s hard to believe this wasnโ€™t thought of sooner. Weโ€™ve validated the utility of both amphibious warships and littoral forces, demonstrating the ability to fight as the landward component of the fleet.โ€

Colonel Niedziocha, Commanding Officer, 31st Marine Expeditionary Unit

The Marine MV-22B loaded AN/SSQ-62F DICASS sonobuoys while onboard the George Washington, the latest generation of directional command active sonobuoys built by Ultra Maritime.

U.S. Navy Sailors with the aircraft carrier USS George Washington (CVN 73) load buoys onto a U.S. Marine Corps MV-22B Osprey assigned to Marine Medium Tiltrotor Squadron (VMM) 265 (Rein.), 31st Marine Expeditionary Unit, during anti-submarine warfare operations aboard the George Washington, in the Philippine Sea, Aug. 8, 2025. (U.S. Marine Corps photo by Cpl. Alora Finigan)

The U.S. Marine Corps and U.S. Navy did not disclose specifics of the anti-submarine warfare test. It is the second known test of the MV-22B with sonobuoy deployments.

According to the Marine Corps, pairing anti-submarine warfare capabilities with the MV-22B “leverages the unique range, speed, and carrying capacity capabilities of the MV-22B through the deployment of advanced sensors and integration with U.S. Navy capabilities, allowing for rapid response and persistent surveillance”.

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