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are stated in National Presidential Directive Number 40, which reads:

Access to space through U.S. space transportation capabilities is essential to:
# place critical United States Government assets and capabilities into space;
# augment space-based capabilities in a timely manner in the event of increased operational needs or minimize disruptions due to on-orbit satellite failures, launch failures, or deliberate actions against U.S. space assets;
# support government and commercial human space flight.The United States, therefore, must maintain robust, responsive, and resilient U.S. space transportation capabilities to assure access to space.

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