San Diego on 20 February 1963. Following three weeks of upkeep, her crew painted a white hash mark on her sail signifying her third consecutive Battle “E” award, and she continued workups and other duties in the San Diego area. Her next overhaul period began at the Puget Sound Naval Shipyard in Bremerton, Washington, on 22 July 1963 and lasted until 11 February 1964. After a brief workup and training period in the Pacific Ocean, Bugara was assigned duty with the U.S. Seventh Fleet for another deployment to the Western Pacific beginning on 16 April 1964. She stopped at Pearl Harbor to have main generators 1 and 2 replaced and reported back for duty with the Seventh Fleet on 26 May 1964. During her deployment, she provided services to aircraft and surface ships of the U.S. Navy, Republic of China Navy, and Philippine Navy. Vietnam War During Bugara′s Western Pacific deployment, the Gulf of Tonkin Incident of 2 and 4 August 1964 brought the United States into direct involvement in the Vietnam War. As a result of the incident, Bugara was assigned to Task Force 77 for operations in the South China Sea between 8 August and 4 September 1964. She arrived at San Diego on 22 October 1964, having traveled during her deployment, making port calls at Cebu City on Cebu Island in the Visayas in the Philippines; Hong Kong; Subic Bay on Luzon in the Philippines, and Yokosuka, Japan. After returning to San Diego, Bugara commenced local operations until she entered Hunters Point Naval Shipyard and San Francisco for a battery renewal in June 1965. With it complete, she returned to San Diego. Bugara left San Diego on 18 October 1965 for another cruise in support of U.S. Seventh Fleet operations off Vietnam. While en route, she stopped at Pearl Harbor, where she was completely outfitted with the Steinke hood device for escape from a disabled submarine. During her deployment, she also made port calls at Yokosuka, Japan; Buckner Bay, Okinawa; and Subic Bay in the Philippines. On 15 November 1965, she celebrated the 21st anniversary of her commissioning by making her 6,000th dive. By the end of 1965, she was at Subic Bay with the U.S. Seventh Fleet and during her deployment she conducted operations and training with units of the U.S., Philippine Navy, Japanese Maritime Self-Defense Force, and Republic of China Navy. On 1 May 1966,