BRP Datu Marikudo (PS-23) was a Miguel Malvar-class corvette of the Philippine Navy. She was originally built as USS PCE(R)-853, a PCE(R)-848-class patrol craft for the United States Navy during World War II. She was renamed USS Amherst (PCE(R)-853) on 15 February 1956. In February 1970, Amherst was decommissioned and transferred to South Vietnam for service in the Republic of Vietnam Navy as RVNS Vạn Kiếp II (HQ-14). She remained in South Vietnamese service until the collapse of that country in 1975. Vạn Kiếp II was one of several ships that fled from South Vietnam to the Philippines. She was then commissioned into the Philippine Navy on 5 April 1976 and named in honor of Datu Marikudo. Along with other World War II-era ships of the Philippine Navy, Datu Marikudo was considered as one of