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I have never agreed with Zubrin's prinsipal that a 400 day mission would only need a 5 man crew to be completely successful.  I am of the opinion that for a successful mission, a crew of at least 8 is required (2 Engineers, a Biochemist, a Geochemist, 2 Geologists, a Meteoroloist and a Medic).  I was wondering what anyone else regarding crew size and composition when it comes to a successful mission.  What does anyone think?