Through the next 3 months, "Fullam" continued her patrol, escort, and bombardment missions in the Solomons, joining in the landings on Emirau 20 March 1944. After training and replenishment at Port Purvis on Florida Island in the Solomons, and at Espiritu Santo, the destroyer joined the 5th Fleet for the assault on the Marianas. She arrived off Tinian 12 June for the bombardments on Tinian and Saipan which began the next day and continued until the landings of 15th. Ordered west to search for an enemy task force known to be moving into position to oppose the landings, "Fullam" rejoined the carrier task force 19 June as the Battle of the Philippine Sea opened. During this 2-day engagement, she joined in the general firing which combined with fighter actions brought down the vast majority of the Japanese naval aviation as an effective element in the war. Completing her assignment in the Marianas with duty screening the cruisers bombarding Guam as well as firing on targets there herself, "Fullam" departed the Marianas 10 August for Eniwetok.