Conceived as the American response to the Soviet manned lunar program "L3", the "Helios" Project was developed fully in 1963. (Earlier project coding had called it "Apollo", but investigations revealed that "Apollo" was also synonymous with "destroyer" in Greek mythology and was dropped.) It would consist of a command module, with a crew of three; a service module, to provide electricity and propulsion; and a lunar landing module, launched on the "Jupiter-V" rocket. It was corrected and the spacecraft was man-rated again in late fall 1968. Missions-