Gemini III (Molly Brown)...very significant as it was the first spacecraft able to change its orbital plane and do maneuvers. Everybody else before it was pretty much just cargo. Gemini III saw the use of the Titan II for a crewed launch. The Titan II uses hypergolic fuel for its booster engines...very dangerous as later flights found out. https://en.wikipedia.org/wiki/Gemini_3 Gus Grissom and John Young were at the controls. Infamous for its 'corned beef on ry