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Word on the street is that one is already in space on the USAF X-37B. And China is flying one too. http://www.ibtimes.co.uk/space-race-revealed-us-china-test-

• andygates 10y ago
  That's a low-quality source in a hype-loop with a True Believer from Reddit, so take that 'word' with a bushel of salt.