The Harpoon (RGM-84, UGM-84, AGM-84) is a U.S.-designed subsonic antiship cruise missile that has been in service since 1977. Numerous variants have been produced since its inception, including air-, ship-, and sub-launched versions. The Harpoon has also undergone multiple upgrades to improve its range and guidance. Variants of the Harpoon have been exported to 32 countries.