BRP Sultan Kudarat ( PS - 22 ) BRP " Sultan Kudarat " ( PS - 22 ) is a of the Philippine Navy . She was originally built as USS " PCE - 881 " , a for the United States Navy during World War II . She was acquired by the Philippine Navy on April 1976 , and was commissioned later on as RPS " Sultan Kudarat " ( PS - 22 ) . The ship is . Along with other World War II - era ships of the Philippine Navy , " Sultan Kudarat " is considered as one of the oldest active fighting ships in the world today . History . Commissioned in the US Navy as USS " PCE - 895 " in 1944 , she was renamed USS " Crestview " ( PCE - 895 ) on 15 February 1956 , named for the City of Crestview , Florida , " in accordance with a recent Navy decision to name its patrol vessels , previously known only by the hull number , by the names of cities of the United States with populations between 2 , 500 and 10 , 000 " . She was then transferred to the Republic of Vietnam on 29 November 1961 . She served the Vietnamese Navy as RVNS " Dong Da II " ( HQ - 07 ) up until her escape to the Philippines in 1975 , together with other South Vietnamese Navy ships and their respective crew . She was formally acquired by the Philippine Navy on 5 April 1976 and was commissioned into the Philippine Navy on 27 July 1976 and was renamed RPS " Sultan Kudarat " ( PS - 22 ) . She was renamed to BRP " Sultan Kudarat " ( PS - 22 ) in June 1980 using a new localized prefix . Between 1990 and 1991 the " Sultan Kudarat " underwent major overhaul , weapons and radar systems refit , and upgrade of communications gear . She is currently assigned with the Patrol Force of the Philippine Fleet . Technical details . There are slight differences between the BRP " Sultan Kudarat " as compared to some of her sister ships in the Philippine Navy , since her previous configuration was as a patrol craft escort ( PCE ) , while the others are configured as rescue patrol craft escort ( PCER ) and minesweepers ( " Admirable " class ) ships . Armaments . Originally the ship was armed with one Mk . 26 3 " / 50 caliber dual purpose gun , three single Bofors 40 mm guns , one Hedgehog depth charge projector , four depth charge projectiles ( K - guns ) and two depth charge tracks . Changes were made during its transfer to the South Vietnamese Navy , as it appears in photos show the removal of her anti - submarine weapons , and addition of four Mk . 10 Oerlikon 20 mm guns . This made the ship lighter and ideal for surface patrols , but losing her limited anti - submarine warfare capability . The same configuration applies when she was transferred to the Philippine Navy up until around 1990 - 1991 . During its overhaul and refit between 1990 to 1991 , the Philippine Navy made some changes in the armament set - up . Some sources claim the loss of its three Bofors 40mm cannons during the 1990 - 1991 overhaul and refit period , but photos at of 2009 show the Bofors guns still present . Final armaments fitted to the ship are one Mk . 26 3 " / 50 - caliber gun ( fore ) , three single Bofors 40 mm cannons ( aft ) , four Mk . 10 Oerlikon 20 mm cannon s ( 2 each on bridge wings ) , and four M2 Browning 12 . 7 mm / 50 caliber machine guns ( 2 besides main bridge , 2 aft near the lower Bofors gun tub ) . Electronics . Also during the refit the ship ' s RCA CRM - NIA - 75 surface search radar and RCA SPN - 18 navigation radar was replaced by a Raytheon AN / SPS - 64 ( V ) 11 surface search and navigation radar system . Later modifications included the installation of an additional Furuno navigation radar , long range and satellite communications system and GPS system standard to all Philippine Navy ships . Machinery . The ship is powered by two GM 12 - 278A diesel engines , with a combined rating of around driving two propellers . The main engines can propel the 914 tons ( full load ) ship to a maximum speed of around . Recent photos show that air - conditioning was also installed on the " Sultan Kudarat " .