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U.S., Portugal Navies Team Up for Anti-Submarine Warfare Training with Unmanned Platforms

Navies from the U.S. and Portugal recently joined forces in joint anti-submarine warfare training. The exercises focused on integrating submarines with unmanned platforms for enhanced operational capabilities.

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In this picture there are ships on the water at the bottom side of the image and there are...
In this picture there are ships on the water at the bottom side of the image and there are vehicles, trees, poles, aircraft, and buildings in the background area of the image.

U.S., Portugal Navies Team Up for Anti-Submarine Warfare Training with Unmanned Platforms

Navies from the United States and Portugal recently collaborated in joint anti-submarine warfare (ASW) training during NATO's Dynamic Messenger/REPMUS 2025 exercises off Portugal. The exercises focused on integrating submarines with unmanned platforms for operational advantage.

The U.S. Navy's Virginia-class fast-attack submarine USS New Mexico (SSN 779) and Portugal's diesel-electric submarine NRP Tridente (209PN) took part in the training. USS New Mexico deployed a submarine-launched unmanned aerial system (UAS) as part of operational experimentation during the exercise. Both exercises aimed to deliver unmanned systems and capabilities into Allied naval forces with speed and scale.

Rear Admiral Grabbe, Commander of NATO Submarines, highlighted the integration of submarines with unmanned platforms for operational advantage. Vice Admiral Robert Gaucher, Commander Submarine Force / Allied Submarine Command, linked the trials to protecting critical undersea infrastructure. The Portuguese-led Robotic Experimentation and Prototyping with Maritime Unmanned Systems (REPMUS) exercise focused on maritime unmanned systems development and interoperability. The training also involved the Portuguese frigate NRP Francisco de Almeida (F334) and patrol vessel NRP Setubal (P363).

The joint exercises between the U.S. and Portuguese navies demonstrated the potential of integrating submarines with unmanned platforms. This integration aims to enhance operational capabilities and protect critical undersea infrastructure. Both navies expressed commitment to further developing and implementing these technologies.

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