US Embassy, Canberra, Australia reported, April 24, 2022:
"The United States Navy submarine USS Springfield (SSN 761) has arrived [at HMAS Stirling aka Fleet Base West, at Rockingham, just south of Perth, Western Australia] for a scheduled port visit.
[Los Angeles class, SSN] Springfield is forward-deployed to the Pacific island of Guam and routinely operates in the Indo-Pacific, conducting maritime security operations and supporting national security interests."
[Since March 21, 2022, USS Springfield has been in Submarine Squadron 15 based at Naval Base Guam (Apra Harbour).]
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5 days ago US Embassy, Canberra, reported:
"...The submarine tender USS Frank Cable (AS 40) [also normally based at Guam] is visiting HMAS Stirling Naval Base near Rockingham as part of routine operations in the Indo-Pacific region...."
Pete Comment
As far as I'm aware this is the first US SSN port visit to Australia since the AUKUS submarine plan was announced in September, 2021.