Defence officials will be scrutinised over how the US is designating a key Australian naval base for the AUKUS pact and how taxpayers are shouldering the burden of cost for upgrades.
The Greens are expected to use senate estimates on Tuesday to press officials and the Albanese government about HMAS Stirling in Western Australia being classed as a US shore installation.
A US government procurement site has since April referred to the base as Naval Support Activity Stirling.
Bases located in the US and across the world are referred to as "naval support activity".
US War Secretary Pete Hegseth told a major defence summit in Singapore at the weekend he had authorised the establishment of naval support activity Stirling submarine squadron three, which will result in the first American sailors arriving in WA later this year.
