HMAS Choules is a Bay Class Landing Ship Dock, based on the Royal Schelde Enforcer design. The ship was originally commissioned with the Royal Fleet Auxiliary service on 28 November 2006 as RFA Largs Bay (L3006). The Bay Class is a proven capability with Largs Bay having provided humanitarian relief as part of the international response to the Haiti earthquake in 2010.
At the end of 2010, Largs Bay was marked as one of the vessels to be removed from service under the UK Strategic Defence and Security Review.
On 17 March 2011, the Department of Defence announced that the Royal Australian Navy would be bidding for Largs Bay. This was followed on 6 April by news that a A$100 million (£65 million) bid had been successful.