Ok Titan III is a huge subject so two posts to cover the Titan III and the hypothetical Titan IIIs...   The Titan III family really starts with the first launch of Titan Agena… aka Titan IIIB.   Err WAIT! What about Titan IIIA?  Well, if you had read my previous article on the Titan II, you would know about Titan IIIA.    The Titan II article: https://forum.kerbalspaceprogram.com/index.php?/topic/122020-181-1101-bluedog-design-bureau-stockalike-saturn-apollo-and-more-v171-%D
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