What is the U.S. military’s secretive ‘space plane’ up to?

The X-37B Orbital Test Vehicle 3, the U.S. Air Force's secretive robotic space plane, has been on its latest mission for over 10 weeks now, zipping around in low-Earth orbit since it made its third launch into space back on December 11th. However, given what the pint-sized robot space shuttle is capable of, or should I say incapable of, it begs the question 'What is the military using it for?'

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