The Air Force's reusable spacecraft went into orbit on March 5, 2011, but as was the case during its first launch in 2010, very little has been known about its mission or what payloads it might be carrying because its missions are classified. That has led to speculation that the spacecraft is involved in intelligence gathering operations or the testing of new technologies.
Measuring 29 feet in length and having a 15-foot wingspan, the unmanned re-usable X-37B Orbital Test Vehicle looks like a miniature version of NASA’s now retired space shuttles.
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Air Force's X-37 mini shuttle