HMAS Koala explained

HMAS Koala was a Bar-class boom defence vessel operated by the Royal Australian Navy (RAN) during World War II. She was constructed by Cockatoo Docks and Engineering Company, Sydney, and launched on 14 November 1939.^[1] The ship served in Darwin during World War II, and received the battle honour "Darwin 1942–43".^[2] ^[3] She was sold in 1969 and was sunk during the Brisbane floods in 1974.

References

http://www.naa.gov.au/naaresources/Publications/research_guides/guides/dockyard/pages/chapter03/koala.htm

Web site: The Sydney Morning Herald, Monday 6 November 1939, p.10.. 9 August 2010.
News: Navy Marks 109th Birthday With Historic Changes To Battle Honours . 1 March 2010 . https://web.archive.org/web/20110613184920/http://www.navy.gov.au/Navy_Marks_109th_Birthday_With_Historic_Changes_To_Battle_Honours . 13 June 2011 . Royal Australian Navy . 23 December 2012.
Web site: Royal Australian Navy Ship/Unit Battle Honours . 1 March 2010 . Royal Australian Navy . https://web.archive.org/web/20110614064156/http://www.navy.gov.au/w/images/Units_entitlement_list.pdf . 14 June 2011 . 23 December 2012.