The United States has publicly funded its human spaceflight program on a continuous basis for more than a half-century, through three wars and a half-dozen recessions, from the early Mercury and Gemini suborbital and Earth orbital missions, to the lunar landings, and thence to the first reusable winged crewed spaceplane that the United States operated for three decades.
Today the United States is the major partner in a massive orbital facility - the International Space Station - that is becoming the focal point for the first tentative steps in commercial cargo and crewed orbital space flights.
Pathways to Exploration by Committee on Human Spaceflight
National Academies Press | October 14, 2014 | English | ISBN: 0309305071 | 279 pages | PDF | 13 MBhttp://www13.zippyshare.com/v/36431751/file.html
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