Underway for the western Pacific on 29 April, the guided-missile destroyer crossed the central Pacific; and, after a short liberty period at Yokosuka, Japan, the warship headed south to Subic Bay, arriving there on 24 May. Underway again three days later, "Berkeley" sailed with the aircraft carrier to the Gulf of Tonkin before joining the cruiser and TU 77.1.1 for a "Sea Dragon" patrol. The task unit cruised off North Vietnam near Hon Me and Hon Matt Islands, searching for enemy waterborne logistics craft and firing on designated targets ashore. This pattern—small craft search in the morning followed by shore bombardment missions later in the day—became the daily routine of "Berkeley"'s later "Sea Dragon" patrols.