DARPA's XS-1 Concept Video
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For more details on the XS-1, check out: http://governmentsecrets.com/2014/07/work-commences-on-experimental-spaceplane-xs-1-designs/
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THIS IS 50 YEARS OLD TECHNOLOGY WITH A FIEW IMPROVEMENTS - NOT SO USEFUL - THERE ARE OTHER MUCH BETTER WAYS TO BUILD SPACESHIPS
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