From 1 November, when she covered the landings on Cape Torokina, Fullam guarded convoys carrying reinforcements and supplies to Bougainville as well as bombarding enemy installations in the Empress Augusta Bay area 25 January 1944.

Four days later, at Vella Lavella, transports Fullam screened, embarked a mixed reconnaissance party of New Zealanders and American sailors, which was landed on the Green Islands, 30 January.

Despite this, Fullam not only rescued all of Noa's men, but also carried out daily shore bombardment and night harassing fire, as well as covering the work of underwater demolition teams, as Peleliu was assaulted, then sailed for temporary repairs at Manus and a west coast overhaul.

After providing air cover to the landings of 1 April, her group began continual strikes on the airfields on the Sakashima Clunto from which suicide flights were launched by the Japanese.

Assigned to operate with carriers against northern Japan, Fullam cleared Eniwetok 11 August for Adak, but arriving after the close of hostilities, instead took up escort and patrol duties in the Aleutians until entering Puget Sound Naval Shipyard 13 November.