From 1 December to 22 February 1965 "Krishna" reactivated , and on 1 June she was assigned to Service Force, Pacific Fleet. Departing Little Creek, she steamed via Pearl Harbor and Guam for duty in the Far East. Operating out of Subic Bay, Philippines, she reached the Gulf of Thailand off the coast of South Vietnam 17 September and began duty as support ship for patrol craft of U.S. Coast Guard Squadron One, Division 11 based at An Thoi Naval Base on Phu Quoc Island. While the cutters patrolled coastal waters to prevent infiltration of ammunition and supplies to the Viet Cong, "Krishna" served as a repair facility and fueling station as well as an operations, communications, and command center. Later in the year she also provided services for eight 50-foot Patrol Craft Fast boats that arrived to strengthen the coastal surveillance program.