When the first United States nuclear-powered submarine deploys to an Australian naval base in 2027, its presence will underscore the advantage of interoperability held by the U.S. and its Allies.
The allied militaries’ ability to operate seamlessly together — interoperability — is crucial to deterrence, especially in the Indo-Pacific, where the Chinese Communist Party (CCP) has grown increasingly aggressive. The Allies are “training together more extensively and buying the same equipment, aiming to make their forces not just interoperable, but interchangeable,” according to a February 2026 report by the Wall Street Journal newspaper. The U.S. Navy plans to rotate four of its conventionally armed Virginia-class submarines through the base, HMAS Stirling, in what will be known as Submarine Rotational Force — West (SRF-West). The fast attack subs will help Canberra protect its trade routes in the East China and South China seas, where it has called the CCP’s actions “unsafe and unprofessional.”
The SRF-West deployments are part of the trilateral security pact among Australia, the United Kingdom and U.S. known as AUKUS. In addition to the deployments, the AUKUS agreement calls for the U.S. to sell three to five Virginia-class subs to Australia, with the first delivery scheduled for the early 2030s. The U.S. and the U.K. will eventually help Australia to design and build another three to five of the attack submarines.
Australia is investing almost $6 billion at Stirling for upgrades that include improvements to the submarine pier and a facility to handle radioactive waste, according to the Journal. In 2025, the Virginia-class USS Vermont visited Stirling, where U.S. and Australian personnel worked together during a monthlong submarine maintenance period (SMP) that served as a test for the 2027 rotational SRF-West deployments. The Western Australia location gives the U.S. a berth that is relatively close to regional flashpoints such as Taiwan, according to the Journal.
“If you were in some kind of conflict, and your ships are getting damaged, you’re going to want to return to the fight quickly,” U.S. Navy Rear Adm. Lincoln Reifsteck, who commands a U.S. submarine group, said of the SMP capability during a recent visit to Stirling, according to the Journal. “So having this geography to enhance what you have in Guam, to enhance what you have in Pearl Harbor [Hawaii] … it’s going to make the U.S. Navy able to get back to it faster.”
Australia also said in February 2026 that it will spend $2.8 billion on a “down payment” for a facility near the southern city of Adelaide where it will build its own nuclear-powered submarines under AUKUS.
“This is a driver, not just of our national security and how we’re going to defend our nation into the future. It’s also a driver of our economic prosperity,” said Prime Minister Anthony Albanese, according to Australia’s NewsWire service.
The rotation of the Virginia-class submarines through Australia will not only demonstrate U.S. commitment to security and stability in the Indo-Pacific, but it also will reshape regional deterrence.
“When we operate with Allies and partners, we multiply capability. We raise the threshold for aggression,” U.S. Navy Adm. Samuel Paparo, Commander of U.S. Indo-Pacific Command, said during a keynote address at Honolulu Defense Forum in January 2026.