Deployed to Australia in February 1942, being assigned to the new Fifth Air Force being formed after the withdraw from the Philippines of remaining heavy bombers. The squadron reached Australia in March 1942, but did not enter combat until September, when it finally had a reasonable complement of aircraft. From then until November 1944, the squadron operated in support of the campaign in Papua New Guinea, first from Australia, then from New Guinea and Owi Island, concentrated in particular in attacks on shipping. The unit experimented with low level skip bombing, using this tactic at the Battle of the Bismarck Sea, 2–4 March 1943 with some success.