Studied by Douglas Aircraft Company in 1965, this rocket consisted of a whole Saturn IB with 4 strap-on UA1205 SRBs that have flown on the Titan 3E interplanetary missile carriers. All components of the vehicle have flown, but not together for this concept.
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This article is an automated import of the Wikipedia article "Saturn IB-D", available at https://en.wikipedia.org/wiki/Saturn_IB-D . Text is licensed under CC BY-SA 4.0.