On 1 August 1944, PCER-852 stood out of Bermuda bound for Norfolk, Virginia with 26 prisoners of war—sailors from the German submarine U-505, captured in June by a “hunter-killer” group formed around escort carrier USS Guadalcanal (CVE-60).

During her six months in the war zone, her medical staff and crew handled over 1300 dead, critically wounded, and ships' survivors.

In September 1947, the Bureau of Ships shifted the infrared test program to the Naval Underwater Sound Laboratory at New London, Connecticut with E-PCER-852 operating from that base.

During that time, her zone of operations also expanded to include the coastal waters along the southeastern United States and thence into the West Indies.

[6] After she was cleaned, repaired and made ready for service, she was formally acquired by the Philippine Navy on 5 April 1976, and was commissioned together with other ex-RVN ships on 7 February 1977.

[7] Between 1990 and 1992 the Miguel Malvar underwent major overhaul, weapons and radar systems refit, and upgrade of communications gear.

[11] In July 2018, the BRP Miguel Malvar represented the Philippine Navy in a Trilateral Maritime Patrol (TMP) meeting with the Royal Malaysian Navy ships KA Tun Azizan and KD Todak at the Eastern Sabah Security Zone (ESSZone) in Sabah.

[12] In September 2018, the crew of the BRP Miguel Malvar rescued and evacuated at least 50 families from a huge fire that broke out near the Pier where the ship was docked in Bongao, Tawi-Tawi.

[13] In December 2020, the ship responded to a distress call and rescued 33 People off the Coast of Langahan Island, Tawi-Tawi after their vessel, the M/L Utoh Salon damaged its engine shaft and went adrift for several hours.

[14] Miguel Malvar was decommissioned alongside her sister ship Magat Salamat on 10 December 2021, in a ceremony at Naval Base Heracleo Alano.