Australia will acquire a third secondhand Virginia-class submarine from the United States for the Aukus program, replacing a mixed plan to achieve substantial cost savings and simplify training and operations.

The plan now calls for three in-service Virginia-class submarines, all of the same variant, rather than a mix of used and new boats.

Three in-service Virginia-class submarines will be delivered from U.S. Navy stock under an amended Aukus deal announced at the Shangri-La Dialogue in Singapore.

Officials cite concerns about U.S. Navy reserve levels and production rates, with benefits focusing on simplified operations and maintenance.

Australia frames Aukus as a channel for deterrence and industrial collaboration, while weighing domestic politics and regional security dynamics.

Critics in the United States also question prioritizing Australia’s stockpiles before bolstering domestic capabilities, reflecting ongoing Aukus skepticism.

Critics, including Greens senator David Shoebridge, argue Aukus is a poor deal, though some former officials acknowledge reduced risk and streamlined operations despite potential trade-offs in capability and lifespan.

Some U.S. voices question selling nuclear-powered submarines to Australia before rebuilding Washington’s own forces, highlighting broader strategic debates.

The announcement and discussions unfolded at the Shangri-La Dialogue, a forum gathering defense leaders from about 40 countries.

U.S. security voices, including proponents of accelerated defense investment, have pushed for higher allied spending to support Aukus.

The announcement was issued in a joint statement by Australian Deputy PM Richard Marles, U.S. Defense Secretary Pete Hegseth, and U.K. Defense Secretary John Healey, signaling trilateral coordination.

The joint statement outlined steps to simplify supply chains, maintenance, and costs under the revised arrangement.