Australia has prepared for the 2027 arrival of Submarine Rotational Force - West, by receiving USS Vermont (SSN 792), a US Virginia class submarine, at HMAS Stirling on 29 October 2025 for the Submarine Maintenance Period (SMP).
“I can’t overstate the value of training and working with AUKUS counterparts, and applying that training at our base while testing our infrastructure and systems. It strengthens our ability to operate and sustain nuclear-powered submarines in Australia. This visit also demonstrates the deep commitment of our AUKUS partners to supporting Australia’s future submarine capability," Director-General Australian Submarine Agency, Vice Admiral Jonathan Mead, highlighted.
“Australia is firmly on track to commence Submarine Rotational Force – West in 2027 which will further accelerate Australia becoming sovereign ready to safely own, operate and maintain our first sovereign Virginia class submarine from the early 2030s. “
Together with Australia's AUKUS partners, the country has the responsibility of coordinating, supporting and delivering a significant package of maintenance work on USS Vermont.
“The visit of USS Vermont to HMAS Stirling is another tangible example of the strong partnership between the navies of Australia, the United States and the United Kingdom. This visit reflects the deep trust, technical cooperation, and shared commitment between our nations to maintaining a stable, secure, and prosperous Indo-Pacific region," Chief of the Royal Australian Navy, Vice Admiral Mark Hammond, said.
“I am particularly proud of the 13 Royal Australian Navy submariners who sailed into Fleet Base West as part of the ship’s company of USS Vermont, following the completion of extensive training in the United States necessary to building the skills and experience to support Australia’s future nuclear-powered submarine capability."
USS Vermont has included 13 Royal Australian Navy (RAN) personnel in the crew of 134. These are from the cohort of officers and sailors that have completed the rigorous training in the US.
The SMP will build on last year’s milestone, when Australian personnel participated in the first-ever maintenance of a US conventionally-armed, nuclear-powered submarine on home soil during the 2024 Submarine Tendered Maintenance Period.
This year’s SMP will involve a larger and more complex package of work that more closely reflects the type of maintenance that will be required when Submarine Rotational Force – West begins operations at HMAS Stirling in 2027.
Unlike the previous maintenance period, this year’s work is being carried out without a tender ship – meaning Australian personnel are taking on even greater responsibility for executing complex maintenance activities on site.
During this maintenance period, ASC will have an active role supporting work streams, including the provision and operation of pier temporary services and other support services like scaffolding.
Working alongside US personnel from Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility (PHNSY & IMF), 19 ASC International Military Students and a further two from Raytheon and Thales are currently being trained at PHNSY & IMF.
They have returned to Australia for the SMP to help deliver the majority of the maintenance effort. This will contribute to sovereign technical uplift and facilitating knowledge transfer in line with an agreed phased capability plan leading up to the 2027 Initial Operational Support (IOS) milestone with the commencement of Submarine Rotational Force – West.
To further assist with the SMP, 22 RAN Fleet Support Unit personnel have also been training at the PHNSY since June 2025, along with eight RAN clearance divers who will work alongside PHNSY Divers throughout the SMP.