The Martin Marietta Spacemaster was a proposed design for the Space Shuttle.
The Spacemaster was a two-stage, reusable space transportation system.
It featured a delta-wing orbiter and a twin-fuselage booster craft.
The orbiter would sit in a recess in the booster during launch and ascent.
The liquid-propellant booster would carry the orbiter to a set altitude, then detach and be piloted back to land. After separation, the orbiter would ignite its own engines to reach orbit.
The Spacemaster was proposed in 1967. NASA did not order any Spacemasters, but it did order the Space Shuttle's external fuel tanks from Martin-Marietta. Martin Marietta is now part of Lockheed Martin

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