US Military Presence in Australia Set to Expand as Washington and Canberra Accelerate Defence Cooperation
SYDNEY/WASHINGTON — Australia and the United States are moving to deepen their military partnership, with the two allies agreeing to accelerate initiatives that could expand the American military presence across Australian bases amid growing strategic competition with China.
The development followed a September 2 meeting in Washington between US Defence Secretary Pete Hegseth and Australian Deputy Prime Minister and Defence Minister Richard Marles, where both sides agreed to speed up force-posture initiatives, strengthen combined logistics and improve interoperability through joint military exercises.
The agreement does not yet specify a particular increase in the number of US troops permanently stationed in Australia. Marles said further details on the expanded American presence are expected to be announced at upcoming Australia-US ministerial talks.
Why Australia is becoming increasingly important to the US
Australia has become a key location for Washington’s Indo-Pacific strategy because of its geography and its proximity to major sea and air routes.
Under existing Force Posture Initiatives, the US and Australia have developed arrangements involving military exercises, logistics, equipment and infrastructure, including support for rotational American air, land and maritime capabilities.
The latest agreement points toward faster implementation of those arrangements, including cooperation involving logistics, air forces, cyber, space and guided-weapons production, according to Australian and US officials.
Australia also hosts rotating US Marines in Darwin, while the two countries are expanding naval cooperation in Western Australia.
US submarines are coming to Western Australia
One of the most significant developments is the planned establishment of the Submarine Rotational Force-West at HMAS Stirling, near Perth.
US nuclear-powered Virginia-class submarines are expected to begin rotating through the facility from 2027, with about 1,000 US Navy personnel expected to support the submarine operations, according to ABC News.
The submarine presence is part of the broader AUKUS security partnership between Australia, the US and the UK, which also aims to equip Australia with nuclear-powered submarines.
The Western Australian base is strategically important because it gives US forces access to the Indian Ocean and provides another location from which submarines can operate and receive logistical support.
China remains the central strategic concern
Australian officials have increasingly pointed to China’s rapid military expansion as a major reason for strengthening Australia’s defence capabilities.
Marles described China’s military build-up as the largest conventional military expansion by any country since World War II, arguing that Australia needs stronger deterrence and a better regional balance of power.
Reuters reported that the announcement comes as China continues expanding its influence across the Pacific, while Beijing has repeatedly criticized AUKUS and warned that the arrangement could contribute to a regional arms race.
The timing is particularly significant because Australia and the US are also increasing engagement with Pacific Island nations. The two countries have announced US$580 million in combined funding for Pacific Island nations, as Washington and Canberra seek to strengthen their regional partnerships.
Australia says it is not hosting a foreign military base
Despite the growing US presence, Australia maintains that it does not permit foreign military bases on its territory.
Instead, American forces operate through rotational deployments, joint exercises, shared infrastructure and agreed force-posture arrangements with the Australian Defence Force. US Marines, for example, rotate through Darwin rather than operating from a traditional permanent US base.
The distinction could become increasingly important as the US and Australia expand cooperation across multiple military domains.
The bigger picture
The latest agreement represents another step in the gradual expansion of the US-Australia defence relationship.
The two countries are already preparing for Talisman Sabre 2027, a major multinational military exercise that Australian Defence says will involve 24 additional partner nations and a combined planning workforce of roughly 800 personnel. The exercise is designed to strengthen interoperability, logistics and operational readiness among participating forces.
Taken together, the developments point to a deeper US-Australian military relationship spanning submarines, aircraft, logistics, cyber, space, guided weapons and multinational exercises.
But the key question now is how far Washington and Canberra intend to take the expansion—and what additional US capabilities could ultimately be positioned in Australia as both countries seek to strengthen deterrence across the Indo-Pacific.
WWC ONE MEDIA MJE
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