Spending the remainder of the year 1967 on local operations out of Pearl Harbor, "Tiru" commenced the year 1968 as a unit of Submarine Division 72 (SubDiv 72), SubRon 7, and Submarine Flotilla 5 (SubFlot 5). On 16 May, the submarine was shifted to operational control of Commander, 7th Fleet, with her home port changed to Yokosuka, Japan. Departing the western Pacific on 4 October after a tour which had included a transit through the Vietnam war zone, "Tiru" returned to the West Coast; and her home port was changed to San Francisco, California, while she became a unit of SubDiv 52, SubRon 5, SubFlot 1.