Just thought this was cool, hadn't heard of it before:
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What is the Pentagon’s secret space drone doing?
For almost two years, an unmanned space plane bearing a remarkable resemblance to NASA’s space shuttle has circled the Earth, performing a top-secret mission. It’s called the X-37B Orbital Test Vehicle — but that’s pretty much all we know for certain.
Theories about its mission have ranged from an orbiting space bomber to an anti-satellite weapon.
The truth, however, is likely much more obvious: According to intelligence experts and satellite watchers who have closely monitored its orbit, the X-37B is being used to carry secret satellites and classified sensors into space — a little-known role once played by NASA’s new retired space shuttle.
Now, with the X-37B, the Pentagon no longer has to rely on NASA, or humans. The X-37B resembles the shuttle, or at least a shrunken down version of the shuttle. Like the space shuttle, the X-37B is boosted into orbit by an external rocket, but lands like an aircraft on a conventional runway. But the X-37B is just shy of 10 feet tall and slightly less than 30 feet long.
Its cargo bay, often compared to the size of a pickup truck bed, is just big enough to carry a small satellite. Once in orbit, the X-37B deploys a foldable solar array, which is believed to power the sensors in its cargo bay.
“It’s just an updated version of the space shuttle type of activities in space,” insisted one senior Air Force official in 2010, the year of the first launch, when rampant speculation about the secret project prompted some to question whether it was possibly a space bomber.
http://nypost.com/2014/09/28/what-is-the-pentagons-secret-space-drone-doing/