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Defense chiefs Pete Hegseth, Richard Marles and John Healey at the Pentagon in December 2025. Photo: Jim Watson/AFP via Getty Images

The U.S., U.K. and Australia will together develop interchangeable sensors and weapons for their uncrewed underwater vessels.

Why it matters: It's the first "signature" undertaking for AUKUS Pillar II, the autonomy, cyber, electronic warfare and quantum side of the trilateral pact so often associated with submarines.