The United States Submarine Maintenance Period 2026 (USSMP26) marks an important step in Australia’s preparations for the establishment of Submarine Rotational Force-West (SRF-W), which is on track to commence from 2027 (Credit: Department of Defence/ OpenAI generated infographic)
Western Australia is emerging as a critical centre of Australia’s nuclear-powered submarine ambitions, with HMAS Stirling playing an increasingly important role in the implementation of the AUKUS security partnership. The arrival of USS Colorado (SSN-788), a United States Navy Virginia-class nuclear-powered attack submarine, for the October–November 2026 Submarine Maintenance Period (SMP) represents another significant milestone in Australia’s journey towards Submarine Rotational Force-West (SRF-West).
From Submarine Visits to Sovereign Sustainment
Since 2024, Western Australia has hosted a series of progressively sophisticated submarine maintenance activities, demonstrating Australia’s growing technical expertise, industrial capacity and operational readiness.
The journey began in August–September 2024, when USS Hawaii (SSN-776), supported by submarine tender USS Emory S. Land (AS-39), participated in Australia’s first joint maintenance period involving a US nuclear-powered submarine.
In October–November 2025, USS Vermont (SSN-792) achieved another milestone when maintenance was undertaken without a supporting submarine tender, relying instead on Australian shoreside infrastructure and a combined Australian–American workforce.
February–March 2026 marked the first maintenance activity on a British nuclear-powered submarine in Australia, involving the Royal Navy’s Astute-class HMS Anson (S123).
Now, USS Colorado is advancing these achievements through increasingly complex maintenance activities undertaken by qualified Australian personnel.
Western Australia’s Expanding Industrial Capability
The current maintenance period demonstrates Western Australia’s transition from hosting visiting submarines towards developing the capacity to sustain them.
Australian personnel are undertaking in-hull maintenance, including thin line towed array replacement and ship repairs. Australian-manufactured sail maintenance scaffolding, specialised equipment and locally produced components are supporting maintenance and capability demonstrations.
The upgraded Diamantina Pier at HMAS Stirling further illustrates the infrastructure investment required to accommodate nuclear-powered submarines.
Importantly, Australian personnel are also participating in simulated radiological scenarios, strengthening radiation protection competencies and nuclear safety procedures without transferring radioactive waste ashore.
These activities represent opportunities for Western Australian engineering firms, maritime contractors, manufacturers, logistics providers and specialist technical services.
Developing Western Australia’s Future Submarine Workforce
The success of AUKUS will depend not only on infrastructure and technology but also on developing a highly skilled Australian workforce.
Western Australia’s vocational education institutions, universities, defence industry businesses and training organisations have an important role in preparing technicians, engineers, maintainers, logisticians and safety professionals.
Skills in nuclear awareness, quality assurance, configuration management, supply chain management, regulatory compliance and specialised maintenance will become increasingly important.
The challenge is to translate these emerging requirements into sustainable education pathways, industry partnerships and long-term employment opportunities.
SRF-West: A Strategic Milestone for 2027
USS Colorado is expected to return to HMAS Stirling in late 2027 as the first submarine to commence rotations under SRF-West.
This development will strengthen Australia’s ability to support visiting American and British submarines while establishing the foundations for its future sovereign, conventionally armed, nuclear-powered submarine capability.
For Western Australia, AUKUS represents more than a defence initiative. It is an opportunity to establish a globally significant submarine sustainment ecosystem, strengthen advanced manufacturing, develop specialised skills and position the state as a strategic maritime industrial centre in the Indo-Pacific.
Disclaimer: This article was generated with OpenAI assistance using information supplied from Australian Department of Defence material. It is intended for informational and educational purposes and does not represent an official statement or endorsement by the Department of Defence.
