The PCFs were quickly used in the PAVN's operation at Thổ Chu and other islands to repel the invasion of the Khmer Rouge. The Swift Boats are still active in the Vietnam People's Navy. Operators - U.S. Navy - Philippine Navy & Philippine Coast Guard - Republic of Vietnam Navy - Khmer National Navy Khmer Rouge, captured from the US Navy and Khmer National Navy - Royal Thai Navy - Maritime Squadron of the Armed Forces of Malta - SENAN - PMSA - Vietnam People's Army, taken from the former South Vietnam Navy Current The Mediterranean island nation of Malta was one of the last operators to make use of two Swift Boats in the Maritime Squadron of the Armed Forces of Malta (AFM). The Swifts were built at the time of the Vietnam war, with the two vessels used in Malta having started their life as training vessels. These craft, transferred by the U.S. government in 1971 when Dr. George Borg Olivier was still Prime Minister, carried hull numbers C23 and C24 respectively (later renamed P23 and P24) and, while somewhat modified, maintained the look of the original riverine warfare boats. The two small inshore patrol boats became the work horses of the AFM's Maritime Squadron and were only retired once four new Austal patrol boats were commissioned in 2010. Former U.S. Navy Vietnam veterans, from the Swift Boat Sailors' Association, visited Malta in 2010 and said the Malta Swifts were the last two still in service, out of hundreds that were built. One of the two patrol boats headed back to the United States to become a memorial in summer 2012 at the Maritime Museum of San Diego in California. The museum has a display paying tribute to the Maltese servicemen who died on board the P23 (the sister vessel of P24) during an accident that occurred on September 7, 1984. The incident – known as the C23 tragedy and the worst peace-time accident suffered by Maltese services personnel – killed five AFM soldiers and two policemen when illegal fireworks about to be dumped into the sea exploded on the bow of the small patrol boat. The AFM retained P23 as a memorial to those killed in the explosion. P23 was also depicted on a Maltese postage stamp commemorating the island's maritime heritage on 10 August 2011. Swift boats are still active in the Vietnam People's Navy, who