Andrews Space ETOS Rocket 3D model

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The Earth-to-Orbit Segment (ETOS) was the working name for a launch vehicle proposed by Andrews Space in 2004, as part of their architecture study for the Constellation/Vision for Space Exploration program. It was to be a new heavy-lift crew and cargo vehicle, capable of supporting (with distributed lift and on-orbit tugs, and coupled with their Crew Exploration Vehicle and Lunar Surface Access Module concepts) crewed lunar missions.