Saturn IB-C

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Studied in 1965, the same year that Project Gemini started, the Saturn IB-C was simply designed as an orbital launch vehicle like the original Saturn IB. The booster would consist of an ordinary Saturn IB with four Minuteman first stages used as strap-on boosters. The Saturn IB core booster did fly from 1966 until 1975, but never with any strap-on boosters.