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MV-22B Osprey Conducts First Forward-Deployed ASW Mission in Philippine Sea

Efforts are under way to embed the Osprey’s rapid buoy deployment into ASW doctrine against growing Chinese submarine strength.

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 training, in the Philippine Sea, Aug. 8, 2025. (U.S. Marine Corps photo by Cpl. Alora Finigan)

Overview

  • On Aug. 8, an MV-22B from VMM-265 aboard USS America teamed with two MH-60R Seahawks to drop sonobuoys in the Philippine Sea, marking the first forward-deployed ASW use of a 31st MEU Osprey in the Indo-Pacific.
  • The operation builds on Atlantic Alliance 2025 trials, when Ospreys from VMM-162 delivered A-size sonobuoys off the U.S. East Coast using ONR-supported automated sonar processing tools.
  • Marine Corps and Navy leaders, including COMSUBGRU2, are refining tactics, command-and-control integration and sensor procedures to make MV-22B contributions part of theater ASW operations.
  • The tiltrotor’s speed, range and payload capacity enable rapid, distributed undersea sensing that complements Navy P-8A Poseidon and MH-60R platforms.
  • Public reporting confirms sonobuoy deployment but leaves unresolved whether live submarine contacts occurred during the Philippine Sea exercise.