supported United Nations forces in Korea from January to June 1951. 1951–1954 On 27 June 1951, Bugara returned to Pearl Harbor to enter the Pearl Harbor Naval Shipyard for her fourth overhaul. During this overhaul, she was converted for submarine snorkel operations and had a new, streamlined conning tower fairwater installed, the first time the Pearl Harbor Naval Shipyard undertook such work. Bugara completed her overhaul on 15 November 1951 and resumed local operations in Hawaiian waters. In May 1952, she departed Pearl Harbor for a cruise to Port Angeles, Washington; Seattle, Washington; Portland, Oregon; and Esquimalt, British Columbia, Canada. On 28 June 1952, she returned to Pearl Harbor and resumed operations off Oahu. During an antisubmarine warfare exercise south of Barbers Point, Oahu, on 3 August 1952, Bugara came to periscope depth and saw a bow with the number "634" painted on it very close and approaching fast at . It was the destroyer escort , which collided with Bugara, damaging her upper sail and periscopes. Bugara returned to Pearl Harbor for repairs to her conning tower. According to Rick Farris, a former crew member on motor watch aboard Bugara during the collision, “The impact caused the boat to roll severely, take a steep down angle, and plunge deeper, giving every indication a forward compartment had flooded and we were headed to the bottom.” Damage control efforts stopped the flooding and Bugara managed to surface. “Damage was fairly serious,” Farris claimed. “The small pump room flooded, both [peri]scopes required replacement, the upper half of the sail and [periscope] shears needed extensive repairs…We were in the [ship]yard [for] several weeks and the cost was, I’m sure, substantial.” After completing her repairs and conducting work-ups and local operations in Hawaiian waters from Pearl Harbor, Bugara visited Hilo, Hawaii, then entered the Pearl Harbor Naval Shipyard for an overhaul on 22 June 1953. After its completion, she departed Pearl Harbor on 23 October 1953 bound for Puget Sound in Washington, where she remained for the next two months. She then returned to Pearl Harbor, arriving there on 23 December 1953. Bugara departed Pearl Harbor on 6 April 1954, for her fifth deployment to the western Pacific. She returned to Pearl Harbor on 8 October 1954, and resumed the routine of rendering services to other types of naval units in Hawaiian waters. On 7 December 1954, she departed Pearl Harbor for San Diego,