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All Stacked UpCredit: USAFThe U.S. Air Force’s X-37B space plane prototype, called the Orbital Test Vehicle 1, is primed for its debut launch into space in April 2010. space.com

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The X-37 and X-40 research efforts were originally started (by NASA and U.S. Air Force, respectively) as completely separate and unrelated programs. However, both programs have since been merged into a single one. Therefore they are both discussed on this page.

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NASA’s X-37B Spacecraft Adopted by United States Air Force as Military Space Plane | USAF Planning X-37B as Spy Plane | Space.com

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from Mail Online

Secret mission accomplished: America's mysterious space plane to land after a YEAR in orbit - and no one knows what it did up there

America's mysterious space plane to land after a YEAR in orbit - and no one knows what it did up there

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