In 1971 the US Navy transferred further units in order to replace the previous generation. Two GUPPY-type submarines were an interim measure until new submarines being built in Europe became available. "Santiago del Estero" was retired by September 1981 but ARA "Santa Fe" (S-21) would take part in the 1982 Falklands War. She landed a team of "Buzos Tácticos" (tactical divers) on the initial amphibious assault and weeks later, after a successful resupply mission, was spotted on the surface. She was attacked with AS 12 missiles by a British Wasp helicopter and disabled off Grytviken, South Georgia; scuttled at dock by her crew, the submarine was eventually sunk in deep waters by the British some years after the war ended.