AUKUS Moves From Talk To Steel

Washington, London, and Canberra named USS Colorado as the first submarine to rotate to Australia, locking in a concrete AUKUS milestone with a firm late-2027 start.

Story Highlights

USS Colorado will be the first U.S. Virginia-class sub assigned to Submarine Rotational Force-West at HMAS Stirling in late 2027.
The rotation is planned to grow to up to four U.S. attack subs and one United Kingdom attack sub at the Australian base.
Officials say the goal is to build Australia’s ability to run its own nuclear-powered, conventionally armed submarine force.
A member of Congress tied to seapower policy hailed the pick as a key AUKUS step.

What Was Announced and Who Said It

United States, United Kingdom, and Australian defense leaders announced that USS Colorado (SSN 788) is the first U.S. Navy Virginia-class attack submarine assigned to Submarine Rotational Force-West. The governments said the rotation will begin in late 2027 from HMAS Stirling in Western Australia. The joint statement was issued by U.S. Secretary of War Pete Hegseth, Australia’s Deputy Prime Minister and Defence Minister Richard Marles, and the United Kingdom’s Defence Secretary Wes Streeting, confirming the boat, location, and timing.

The trilateral statement also set a target force structure at HMAS Stirling. Officials said the site is projected to host up to four U.S. fast-attack submarines and one United Kingdom fast-attack submarine once the rotation scales up. The governments framed the move as part of AUKUS Pillar I, which focuses on nuclear-powered submarines. This marks a shift from general plans to a named platform and a specific starting window tied to a real base in Australia.

Why The Colorado Assignment Matters

Pentagon messaging linked the rotation to building Australian know-how to own, operate, maintain, and regulate a sovereign, conventionally armed, nuclear-powered submarine capability. Leaders said Submarine Rotational Force-West will also expand maintenance and sustainment options in the region. That matters for daily readiness and long-term learning, since crews gain hands-on practice alongside U.S. and United Kingdom sailors and maintainers at the base that will host these boats.

Representative Joe Courtney, the ranking member on the House Seapower and Projection Forces Subcommittee and co-chair of the Friends of Australia Caucus, publicly backed the choice. He described USS Colorado as the inaugural rotation and called it a milestone for the agreement. His statement signaled buy-in from a lawmaker with direct ties to submarine policy and to the U.S.-Australia relationship, adding to the official endorsement from the three governments.

Where the Rotation Will Happen and When It Starts

HMAS Stirling, near Perth in Western Australia, will host the rotation. The governments and contemporaneous reports named late 2027 as the start of USS Colorado’s time with Submarine Rotational Force-West. That timeline gives Australia and partners a clear target to prepare crews, secure parts, and complete needed base work. It also lets allies plan joint training, logistics, and port calls built around a known submarine and a known window.

The joint statement focused on selection and intent, not on completed operations. It did not explain why USS Colorado was chosen over other Virginia-class boats. It also did not list budgets, detailed construction steps, or a deployment-by-deployment schedule for the full rotation. Those items often sit in separate planning documents due to security and contracting rules. The announced details still establish the who, where, and when of the first step.

How This Fits the Bigger Picture

The Colorado pick reflects a wider pattern in defense programs. Leaders often announce a milestone before every piece of the support system is in place. Submarines need careful maintenance and long shipyard periods, which can slow plans and reduce daily availability. Government watchdogs and budget offices have reported that overhauls often run longer than planned, and that attack submarines have lost many operational days to maintenance delays over the past decade.

USS Colorado will be the first Virginia-class boat assigned to Australia’s Submarine Rotational Force-West at HMAS Stirling in 2027. The Pentagon calls it a milestone for AUKUS Pillar I that strengthens Pacific deterrence. Operational value will hinge on sortie tempo and…

— WatchfulEye (@WatchfulEye_US) October 26, 2026

That history explains why naming a specific submarine and start date matters. A clear assignment focuses work on a real unit, a real pier, and a real calendar. It gives sailors, maintainers, and industry a shared clock. It also signals to allies and rivals that the AUKUS partners are moving from talk to action. The governments say the rotation will boost deterrence and help Australia grow a skilled force for its future nuclear-powered fleet.

What to Watch Next

Watch for Navy and Australian Defence updates on base upgrades at HMAS Stirling, crew training, and sustainment plans. Look for signs that more U.S. and a United Kingdom submarine will join as projected. Track whether maintenance cycles align with the late-2027 window for USS Colorado. These are reasonable markers for how fast the rotation can scale, and for how well it supports the long-term AUKUS goal of a capable, shared undersea presence in the Indo-Pacific.