. "Retired" . "Delta 1000 series"@en . . . "1972-09-23Z"^^ . "8"^^ . . "1975-06-21Z"^^ . "8"^^ . . "The Delta 1000 series (also referred to as Straight-Eight) was an American expendable launch system which was used to conduct eight orbital launches between 1972 and 1975. It was a member of the Delta family of rockets. Several variants existed, differentiated by a four digit numerical code.The same first stage and boosters were used on all variants."@en . .