有声读物: Project Horizon: Establishment of a Lunar Outpost

The US national policy on space includes the objective of developing and exploiting this Nation's space capability as necessary to achieve national political, scientific, and security objectives. The establishment of a manned outpost in the lunar environment will demonstrate United States leadership in space. It will also provide a basis for further explorations and operations on the lunar surface as well as a supporting capability for other US operations in space. - Summary from the text