With the outbreak of World War 2, a need for minesweepers by the Royal Australian Navy, led to the requisition of over 30 civilian vessels, with
Coolebar commissioned as HMAS
Coolebar on 18 December 1939, under the command of Lieutenant Commander Peter M MacIntosh, RANR(S). Based out of
Sydney, she largely served with Minesweeping Group 50, until she was paid-off on 18 February 1943. led to a need for
Coolebar to be recommissioned, and on 1 July 1943 she was brought back to naval service. Reclassified as a stores carrier under the command of Lieutenant Kenneth O Shatwell, RANVR, she sailed for
Darwin, arriving in August. Her service in Darwin saw her awarded the
Battle Honour "Darwin 1942-43" following a review of Australian Battle Honours in 2010. During 1944 and 1945 she ferried supplies between Darwin and Sydney, until being paid-off at war's end on 1 June 1945. ==Post war service==