In 1964, Philco Aeronutronic proposed a lifting body MEM, approximately foot (m) long and foot (m) wide at the tail, which would carry three astronauts. The hull would have consisted of columbium and nickel alloy. The MEM's descent stage would have served as the launch pad for liftoff of the ascent stage, as with the Apollo Lunar Module. A Mars Excursion Module was discussed as a possibility in the Space Task Group Report of 1969, with a development decision required in FY 1974 for a 1981 Mars mission or in FY 1978 for a 1986 mission.
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