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USA-226〔 is the first flight of the second Boeing X-37B, the Orbital Test Vehicle 2 (X-37B OTV-2), an American unmanned robotic vertical-takeoff, horizontal-landing spaceplane. It was launched aboard an Atlas V rocket from Cape Canaveral on 5 March 2011, and landed at Vandenberg Air Force Base on 16 June 2012. It operated in low Earth orbit. Its mission designation is part of the USA series. The spaceplane was operated by the United States Air Force, which has not revealed the specific identity of the payload for the first flight. The Air Force stated only that the spacecraft would "demonstrate various experiments and allow satellite sensors, subsystems, components, and associated technology to be transported into space and back." ==Launch== OTV-2 was launched aboard an Atlas V rocket, tail number AV-026, on 5 March 2011 from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida. It was scheduled to launch on the previous day, 4 March, but weather prevented the launch on that day, forcing the reschedule to 5 March. The launch was conducted by United Launch Alliance. The X-37B spacecraft was originally intended to be deployed from the payload bay of a NASA Space Shuttle, but following the ''Columbia'' accident, it was transferred to a Delta II 7920, then subsequently transferred to the Atlas V following concerns over the X-37B's aerodynamic properties during launch.〔 Prior to the installation of the spacecraft, the Atlas rocket was moved to the launch pad and performed a wet dress rehearsal on 4 February 2011.〔 It was returned to the Vertical Integration Facility the following day for final assembly. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「USA-226」の詳細全文を読む スポンサード リンク
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