HNLMS Utrecht (D817)  HNLMS "Utrecht" (D817) () was a destroyer of the . The ship was in service with the Royal Netherlands Navy from 1957 to 1980. The destroyer was named after the Dutch province of Utrecht and was the eighteenth ship with this name. In 1980 the ship was taken out of service and sold to Peru where it was renamed Castilla. The ship's radio call sign was "PAEY". HNLMS "Utrecht" was one of eight s and was built at the KM de Schelde in Vlissingen. The keel laying took place on 15 February 1954 and the launching on 2 June 1956. The ship was put into service on 1 October 1957. In 1959 the ship received eight torpedo tubes so it could use the British MK 20E torpedo. After a few years these were removed however, because the Dutch navy favored American torpedoes. In 1962 during the West New Guinea dispute "Utrecht" and the frigate engaged Proa’s and fast attack craft in the Battle of Arafura Sea. On 1 August 1980 the vessel was decommissioned and sold to the Peruvian Navy. The ship was put into service on 6 October 1980 where the ship was renamed "Castilla" and decommissioned in 1990.