Continuing in the southwest Pacific as part of Service Force, US 7th Fleet, she operated initially from Australian ports supporting the successful Australian and American campaign to stop the Japanese on New Guinea. "Mizar" made seven unescorted voyages to San Francisco, California, between 12 October 1942 and 9 February 1945 to get fresh meat, fruit, vegetables, dairy products and eggs to supply advanced bases and combatant ships. When not making these crossings of the Pacific Ocean she normally worked between Brisbane and Milne, New Guinea.