Thirty-two minesweepers were ordered by the US (as BAM-1 to 32) intending them to be supplied to the Royal Navy under Lend-lease but 12 were retained for USN use and given names and "AM" hull classification prefix.

Out of the reserved US Navy units, two were transferred to the Philippines as part of the US Military Assistance Program, these were USS Murrelet (renamed BRP Rizal) in 1965, and USS Vigilance (renamed BRP Quezon) in 1967.

[3][4] With over 50 years of active duty with the Philippine Navy, both have been involved in local and international crisis, exercises, and incidents.

[5][6] Although fairly armed for her size, her weapon systems are manually operated and are of World War II origin.

The main engines can propel the 1,250 ton (full load) ship at a maximum speed of around 18 knots (33 km/h).