The US Navy is standing up a new naval support activity at Naval Support Activity (NSA) Stirling in Western Australia. All three outlets report that the initiative is tied to the AUKUS security pact and is intended to provide support for US personnel assigned to Submarine Rotational Force-West. The articles describe the role of NSA Stirling as a support hub for the submarines and associated crews participating in the rotational presence under the agreement. While the reports focus on the establishment and purpose of the activity, they do not provide additional operational details such as timelines, staffing levels, or specific services beyond general personnel support. The sources present the move as part of the broader effort to sustain the rotational force and improve logistics and readiness for participating US forces in the region. Overall, the coverage is consistent: the US Navy creates the support activity at NSA Stirling, and it supports personnel linked to Submarine Rotational Force-West under AUKUS.