The U.S. military's unmanned X-37B robotic space shuttle returned from orbit at 5:48 a.m. in California (1248 GMT)from a secretive 15-month test flight, Air Force officials said on Saturday.The miniature space plane, also known as Orbital Test Vehicle-2, or OTV-2, touched down at California's Vandenberg Air Force Base, 130 miles northwest of Los A...
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