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One of the signs accompanying Apollo 15. It reads

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Apollo

The Apollo series of missions represents the deepest penetration into space by a human crew to date. It also represents the end of the expendable vehicle as the primary vehicle for manned access to space by the United States. Instead, reusable spacecraft, exemplified at present by the Space Shuttle, and in the future by the National Aero-Space Plane (NASP), expand versatility, keep costs within reasonable boundaries, and provide a substantial ability to rescue satellites and astronauts from orbit.

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