The Kidd-class destroyers were a series of four guided-missile destroyers (DDGs) based on the Spruance class. 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 Taiwan, where they have served in the Republic of China Navy as the Kee Lung class since 2005.