The Kidd-class destroyers were a series of four guided-missile destroyers (DDGs) based on the . In contrast to their predecessor's focus on anti-submarine warfare, the Kidds were designed as more advanced multipurpose ships with the addition of considerably enhanced anti-aircraft capabilities. Originally ordered for the former Imperial Iranian Navy, the contracts were canceled when the 1979 Iranian Revolution began, and the ships were completed for the United States Navy. They were decommissioned in 1999 and sold to the Republic of China Navy as the Kee Lung class. History These destroyers were originally ordered by the last Shah of Iran for service in the Persian Gulf in an air defence role around 1973/74. The original order of six ships was tentatively assigned hull numbers DD 993–998 by the U.S. Navy but it was reduced to four ships after U.S. Congress declined to halt the original production run of 30 Spruance ships. Compared to the preceding Spruance class, they retained the former's anti-submarine capabilities while adding two Tartar-D missile launchers for the Mark 26/Standard anti-aircraft missile system. In order to operate more effectively in the Middle East, they also had four air conditioning plants to the Spruances' three, additional dust separators on their gas turbines' air intakes, and increased water distillation capacity. The Shah was overthrown in the Iranian Revolution, prior to Iran accepting delivery of the ships, causing the United States Navy to integrate the vessels into its own fleet in 1981-82 as the Kidd-class. On February 3, 1979, the Iranian government canceled the second two ships in the class, signing a memorandum of understanding indicating that they were available for acquisition by the U.S. Navy. On February 21. 1979, the Iranian Prime Minister notified the U.S. government that Iran intended to terminate the contract of the first two ships, officially cancelling delivery on March 8, 1979. Each ship in the class was named after a U.S. Navy Admiral who had died in combat in the Pacific in World War II: was named after Rear Admiral Isaac C. Kidd, who died on the bridge of his flagship, , during the attack on Pearl Harbor on 7 December 1941. was named after Rear Admiral Daniel Callaghan, who was killed during a surface action at the Naval Battle of Guadalcanal, 13 November 1942, aboard . was named after Rear Admiral Norman Scott, who was killed during the same surface action that killed Admiral