US military space drone X-37B set for Earth return after 22-month secret orbital mission

October 13, 2014 6:01 AM

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The U.S. Air Force now prepares for the arrival of its Boeing-designed X-37B space plane after the spacecraft's secret mission in orbit that lasted over 670 days.(Photo : NASA/Marshall Space Flight Center)

The U.S. Air Force now prepares for the arrival of its Boeing-designed X-37B space plane after the spacecraft's secret mission in orbit that lasted over 670 days.

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