contract to Martin Marietta, and in November the solid-rocket booster contract to Morton Thiokol.

Development

On June 4, 1974, Rockwell began construction on the first orbiter, OV-101, dubbed Constitution, later to be renamed ''Enterprise''. Enterprise was designed as a test vehicle, and did not include engines or heat shielding. Construction was completed on September 17, 1976, and Enterprise was

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