Mono and Stirling islands in the Treasury Islands sub-group. November found her supporting the assault on Bougainville at Empress Augusta Bay. On the day after Christmas, Stringham joined the American forces which outflanked the Bismarck Barrier at Cape Gloucester, near the western terminus of New Britain. From that position, they could move in two directions—west to pounce upon the back of the New Guinea hen or north to the Admiralties to isolate Kavieng and Rabaul. Stringham participated in one operation in each direction. 1944 On 2 January 1944, she supported the forces which landed at Saidor, New Guinea; and, in March, she assisted in the invasion of Emirau. Between these two operations, Stringham helped land troops in the Green Islands, the northernmost subgroup of the Solomons, located between Buka and New Ireland. During the spring of 1944, American military thinking focused increasingly upon the Central Pacific invasion route to Japan. Accordingly, Stringham returned to Hawaii with marines embarked; and both she and her passengers commenced preparations for the invasion of the Marianas. The initial waves of assault troops stormed the beaches at Saipan on 15 June. Stringham discharged her marines the following day and patrolled off Saipan throughout the Battle of the Philippine Sea on 19 and 20 June. On 22 June, Underwater Demolition Team (UDT) 7 shifted to her from for the Tinian phase of the Marianas operation. Until the landings, the high-speed transport conducted sporadic bombardment and harassment fire on Tinian. On 10 July, she sent her UDT men ashore to reconnoiter the two potential landing sites; and, just before the actual assault began on 24 July, her frogmen participated in a daylight feint at Tinian Town to divert Japanese attention from the actual landing sites. On 28 July, she completed her work with UDT 7 in the Marianas and headed for Espiritu Santo, via Eniwetok Atoll. Stringham, was at Purvis Bay, Florida Island, in the midst of exercises preparatory to the invasion of the Palaus when UDT 7 rejoined her on 5 September. By 12 September, she and her frogmen were off the coast of Angaur with Task Group 32.5. At 1035, she disembarked the UDT men at Peleliu to clear a path through heavy minefields. That afternoon, she towed to Kossol Passage, and then returned to work with the UDT teams until 27 September, when she headed for Manus. There she was moored alongside . On