"1957-06-11Z"^^ . . "Atlas A (SM-65A)"@en . "8"^^ . "Retired" . . . "The SM-65A Atlas, or Atlas A, also designated X-11 was the first full-scale prototype of the Atlas missile, which first flew on 11 June 1957. Unlike later versions of the Atlas missile, the Atlas A did not feature the stage and a half design. Instead, the booster engines were fixed in place, and the sustainer engine was omitted.The Atlas A conducted eight test flights, of which four were successful."@en . "4"^^ . . . "4"^^ . . "1958-06-03Z"^^ .