- X-37B 6 Months Mission Testing an Ion Drive http://www.space.com/29282-air-force-x37b-space-plane-thruster.html 12 comments space
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- US Air Force's X-37B Space Plane Wings Past 200 Days in Orbit | Space http://www.space.com/31308-air-force-space-plane-200-days-orbit.html 174 comments
- Air Force's X-37B space plane mystery mission wings by 500 days in orbit | Fox News http://www.foxnews.com/science/2016/10/12/air-forces-x-37b-space-plane-mystery-mission-wings-by-500-days-in-orbit.html 99 comments
- What Is America's Secret Space Shuttle For? - Defense One http://www.defenseone.com/technology/2017/05/what-americas-secret-space-shuttle/137699/ 1 comment
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