被称为轨道验证飞行器-1（OTV-1）的极秘密X-37B是一个机器人可重复飞行器，于4月22日搭乘“宇宙神”-5火箭从卡纳维拉尔角发射升空。
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"This mission will incorporate the lessons learned during the refurbishment process on OTV-1, " said Lieutenant Colonel McIntyre.
ENGADGET: USAF relaunches its first X-37B on a slightly less mysterious spaceflight
OTV-1 launched in April 2010 and spent 224 days in orbit before going through the refurbishment process prior to being prepped for this mission, he said.
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