The US military of secret spaceplane, a robot demonstrator version of one of next generation space shuttle, has seen it was. It flashed. You have the history SpaceWeather.com.
Speculate all, what, you like. It is classified.
Slide show: Military landscaping includes secret mission
Image: Orbital vehicle-1, sister ship, the now test on orbit, back from the first flight in the X 37-B test program under the cover of darkness on Dec. 3, 2010. credit: U.S. air force
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