BRP Magat Salamat (PS-20) is one of several Miguel Malvar class of patrol corvettes in service with the Philippine Navy. She was originally built as USS Gayety (AM-239), an Admirable-class minesweeper with a similar hull to the PCE-842-class patrol craft produced during World War II. In 1962 she was transferred to South Vietnam for service in the Republic of Vietnam Navy as RVNS Chi Lang II (HQ-08). She was acquired by the Philippine Navy in April 1976 and later on commissioned as Magat Salamat. Along with other ex-World War II veteran ships of the Philippine Navy, she is considered one of the oldest active fighting ships in the world today.