BRP Francisco Dagohoy ( PF - 10 ) The BRP " Francisco Dagohoy " ( PF - 10 ) was an " Andres Bonifacio " class frigate of the Philippine Navy that served from 1979 to 1985 . She was one of six ex - United States Navy " Barnegat " - class small seaplane tender s and ex - United States Coast Guard " Casco " - class high endurance cutter s received from the United States after the Vietnam War , two of which were cannibalized for spare parts without entering service . She and her other three sister ships were the largest Philippine Navy ships of their time . History . Construction and United States Navy service 1944 - 1946 . " Francisco Dagohoy " was built in the United States by Lake Washington Shipyard at Houghton , Washington , as the United States Navy " Barnegat " - class seaplane tender USS " Castle Rock " ( AVP - 35 ) . Commissioned in October 1944 , " Castle Rock " served in the Central Pacific during and after World War II . She was decommissioned in June 1946 and placed in reserve . United States Coast Guard service 1949 - 1971 . In 1948 , the U . S . Navy loaned " Castle Rock " to the United States Coast Guard , which commissioned her that year as the cutter USCGC " Castle Rock " ( WAVP - 383 ) . She was later reclassified as a high endurance cutter and redesignated WHEC - 383 . While in Coast Guard service , her primary duty was to patrol ocean stations , reporting weather data and engaging in search - and - rescue and law - enforcement operations . She also performed combat duty in the Vietnam War for a few months in 1971 . Republic of Vietnam Navy service 1971 - 1975 . " Castle Rock " was transferred to South Vietnam on 21 December 1971 and was commissioned into the Republic of Vietnam Navy as the frigate RVNS " Tran Binh Trong " ( HQ - 05 ) . She fought in the Battle of the Paracel Islands in 1974 . When South Vietnam collapsed at the end of the Vietnam War in late April 1975 , " Tran Binh Trong " fled to Subic Bay in the Philippines , packed with South Vietnamese refugees . On 22 May 1975 and 23 May 1975 , a U . S . Coast Guard team inspected " Tran Binh Trong " and five of her sister ships , which also had 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 1979 - 1985 . After " Tran Binh Trong " had been cleaned and repaired , the United States formally transferred her to the Republic of the Philippines on 5 April 1976 . She was commissioned into the Philippine Navy as frigate RPS " Francisco Dagohoy " on 23 June 1979 . On June 1980 she was reclassified and renamed as BRP " Francisco Dagohoy " ( PF - 10 ) . She served in the Philippine Navy until she was decommissioned in June 1985 . Unlike her two other decommissioned sisterships , " Francisco Dagohoy " was never re - activated after her decommissioning . " Francisco Dagohoy " was discarded in March 1993 and probably scrapped . Technical details . There were changes made to the " Andres Bonifacio " class as compared to their original design during its service with the US Navy , US Coast Guard and the Republic of Vietnam Navy . The ships were passed to the Philippine Navy with fewer weapons on - board and old surface search radars , and these were addressed later on by the Philippine Navy through modernization programs , including the addition of a helicopter landing pad in 1979 . The single Mark 12 5 - inch / 38 - caliber ( 127 mm ) gun was " Francisco Dagohoy " s primary weapon . It was mounted in a Mark 30 Mod 0 enclosed base ring and had a range of up to . The gun was a dual - purpose type , capable of both antisurface and antiair warfare . She also carried two twin Mark 1 Bofors 40 mm anti - aircraft guns , four Mark 4 single 20 mm Oerlikon cannons , four . 50 - caliber ( 12 . 7 - mm ) general - purpose machine gun s , and two 81 mm mortars . Radar system installed include the Sperry SPS - 53 Surface Search & Navigation Radar replacing the previously installed AN / SPS - 23 , while retaining both the AN / SPS - 29D Air Search Radar and Mk . 26 Mod . 1 Fire Control Radar System . Hatch and Kirk , Inc . added a helicopter deck aft in 1979 . Although the ship had no capability to house or service visiting helicopters , the helicopter deck could accommodate one MBB Bo 105 C helicopter , used by the Philippine Navy for utility , scout , and maritime patrol purposes . " Francico Dagohoy " was powered by two Fairbanks - Morse 38D diesel engines with a combined power of around 6 , 200 brake horsepower ( 4 . 63 megawatts ) , driving two propellers . The main engines could propel the 1 , 766 - displacement - ton ( standard load ) ship at a maximum speed of around . She had a maximum range of at an economical speed of . The Philippine Navy made plans to upgrade the entire ship class with new radar systems and the BGM - 84 Harpoon long - range anti - ship cruise missile , but this did not materialize due to the worsening political and economic crisis in the Philippines in the mid - 1980s .