USCGC Castle Rock ( WAVP - 383 ) USCGC " Castle Rock " ( WAVP - 383 ) , later WHEC - 383 , was a " Casco " - class United States Coast Guard cutter in service from 1948 to 1971 . Construction and U . S . Navy service . " Castle Rock " began life as the United States Navy " Barnegat " - class seaplane tender USS " Castle Rock " ( AVP - 35 ) . She was laid down on 12 July 1943 by Lake Washington Shipyard , Houghton , Washington , launched on 11 January 1944 , and commissioned into the U . S . Navy on 8 October 1944 . She operated in the Central Pacific during and after World War II . She was decommissioned on 6 August 1946 at San Francisco , California , and placed in reserve . Transferred to the United States Coast Guard . " Barnegat " - class ships were very reliable and seaworthy and had good habitability , and the Coast Guard viewed them as ideal for ocean station duty , in which they would perform weather reporting and search and rescue tasks , once they were modified by having a balloon shelter added aft and having oceanographic equipment , an oceanographic winch , and a hydrographic winch installed . The U . S . Navy loaned " Castle Rock " to the Coast Guard on 16 September 1948 . After undergoing conversion for use as a weather - reporting ship , she was commissioned into the Coast Guard service as USCGC " Castle Rock " ( WAVP - 383 ) on 18 December 1948 at Mare Island Navy Yard , Vallejo , California . U . S . Coast Guard service . North Atlantic and Caribbean service 1948 - 1971 . " Castle Rock " was stationed at Boston , Massachusetts , after her commissioning . Her primary duty was to serve on ocean stations in the Atlantic Ocean to gather meteorological data . While on duty in one of these stations , she was required to patrol a 210 - square - mile ( 544 - square - kilometer ) area for three weeks at a time , leaving the area only when physically relieved by another Coast Guard cutter or in the case of a dire emergency . While on station , she acted as an aircraft check point at the point of no return , a relay point for messages from ships and aircraft , as a source of the latest weather information for passing aircraft , as a floating oceanographic laboratory , and as a search - and - rescue ship for downed aircraft and vessels in distress , and engaged in law enforcement operations . In March 1956 , " Castle Rock " towed the Finnish merchant ship " Sunnavik " from south of Halifax , Nova Scotia , Canada , to safety . " Castle Rock " reported to Guantanamo Bay , Cuba , for service during the blockade of Cuba during the Cuban Missile Crisis in 1962 . " Castle Rock " took part in the United States Coast Guard Academy cadet cruise in May 1963 and again in August 1965 . On 1 May 1966 , " Castle Rock " was reclassified as a high endurance cutter and redesignated WHEC - 383 . On 26 September 1966 her period on loan to the Coast Guard ended when she was stricken from the Navy List and transferred permanently to the Coast Guard . " Castle Rock " was stationed at Portland , Maine , beginning in 1967 , with the same duties she had as during her years at Boston . On 22 February 1967 and 23 February 1967 , she rescued eight people from the sinking fishing vessel " Maureen and Michael " southwest of Cape Race , Newfoundland , Canada . Vietnam War service 1971 . " Castle Rock " was assigned to Coast Guard Squadron Three in Vietnam in 1971 . On her way to Vietnam , she suffered an engineering casualty and sank at her pier in Singapore , but continued on her way after making repairs and reported for duty with the squadron on 9 July 1971 . Coast Guard Squadron Three was tasked to operate in conjunction with U . S . Navy forces in Operation Market Time , the interdiction of communist coastal arms and munition s traffic along the coastline of Vietnam during the Vietnam War . The squadron ' s other Vietnam War duties included fire support for ground forces , resupplying Coast Guard and Navy patrol boat s , and search - and - rescue operations . " Castle Rock " served in this capacity until 21 December 1971 . " Castle Rock " earned two campaign star s for her Vietnam War service , for : Decommissioning . The Coast Guard decommissioned " Castle Rock " in South Vietnam on 21 December 1971 , the day her Vietnam War tour ended . Foreign service . South Vietnamese service . " Castle Rock " was transferred to South Vietnam on 21 December 1971 and commissioned into the Republic of Vietnam Navy as patrol vessel RVNS " Tran Binh Trong " ( HQ - 05 ) . When South Vietnam collapsed at the end of the Vietnam War in April 1975 , " Tran Binh Trong " fled to Subic Bay in the Philippines , On 22 May 1975 and 23 May 1975 , a U . S . Coast Guard team inspected " Tran Binh Trong " and several other former " Casco " - class cutters which had been transferred to South Vietnam in 1971 and 1972 and , like " Tran Binh Trong " , fled to the Philippines in April 1975 . One of the inspectors noted : " These vessels brought in several hundred refugees and are generally rat - infested . They are in a filthy , deplorable condition . Below decks generally would compare with a garbage scow . " Philippine Navy service . After " Tran Binh Trong " was cleaned , repaired , and made ready to return to service , the U . S . Navy formally transferred her to the Republic of the Philippines in 5 April 1976 . She was commissioned in the Philippine Navy as frigate BRP " Francisco Dagohoy " ( PF - 10 ) on 23 June 1979 . She was decommissioned in June 1985 , discarded in March 1993 , and probably scrapped .