Once repaired, "Tiru" left Yokosuka on 9 January 1967 for Chin Hae, South Korea, and while in transit provided services for an Iwakuni-based patrol plane squadron. Operating with Republic of Korea (ROK) ASW forces from 15 January to 17 January, "Tiru" arrived back at Yokosuka on 22 January for upkeep. From 7 February to 20 March, the submarine conducted special operations before returning for further upkeep prior to a "Yankee Station" deployment off Vietnam. She later operated with Nationalist Chinese forces on ASW exercises; conducted additional special operations; and again provided services for patrol plane squadrons based at Iwakuni, before returning to Hawaii on 15 May.