The USS Minnesota, a Virginia class attack submarine, is conducting training off Western Australia ahead of a significant U.S. naval expansion under the AUKUS pact. From 2027, four Virginia class submarines will be based at HMAS Stirling as part of the deal to transfer nuclear submarine capabilities

The U.S. submarine rotation will begin with 50-80 navy personnel arriving at HMAS Stirling this year, increasing to hundreds within two years. The base is undergoing an A$8 billion ($5 billion) upgrade to accommodate the Submarine Rotational Force West.

The strategic location of Western Australia, closer to Asia and the Indian Ocean than the U.S. Pacific Fleet headquarters in Hawaii, enhances the Indo-Pacific defence posture, experts say. Peter Dean, director of Foreign Policy and Defence at the University of Sydney, noted the deployment is key to countering China’s naval presence in the region.

The Virginia class submarine program has been exempted from U.S. budget cuts, with the Trump administration prioritising Indo-Pacific defence. Former Pentagon official Elbridge Colby recently told the U.S. Senate that attack submarines are "absolutely essential" for Taiwan’s defence, stressing the need to ramp up production.

The USS Minnesota moved its home port from Hawaii to Guam in November, reinforcing the U.S. forward-deployed presence. The shift follows increased Chinese naval activity, including a Chinese task force circumnavigating Australia in February and March while holding live-fire drills.

Under AUKUS, Australia will purchase two used Virginia class submarines next decade and co-develop a new nuclear-powered submarine with Britain, replacing its ageing diesel fleet. Currently, 115 Australian personnel are training on U.S. submarines, with 130 more in nuclear maintenance training in Hawaii.

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