 Complete the following phrase:  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 