CNBC - Unmanned US Air Force space plane lands after secret, two-year mission A sonic boom that rattled Central Florida early Sunday morning was no secret.An unmanned military space plane on Sunday morning concluded a almost two-year mission with its first touchdown on Kennedy Space Center's former shuttle runway. It's part of a broader US strategy to develop out-of-this-world technologies that can be used for multiple launches and landings."Today marks an incredibly exciting day for the 45th Space Wing as we continue to break barriers", Brigadier General Wayne Monteith, who commands the space wing, said in a statement. The orbiters "perform risk reduction, experimentation and concept-of-operations development for reusable space vehicle technologies", the Air Force has said without providing details.This fourth mission (OTV-4) of the X-37B broke the record for the most time the space plane has spent in space on Sunday, May 7, 2017.The latter goal is also a ma
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