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Date: 2009-06-16 12:12:13Manned spacecraft Commercial Orbital Transportation Services Spacecraft SpaceX International Space Station program Rocketplane Kistler Space Act Agreement Space Shuttle retirement Orbital Sciences Corporation Spaceflight Human spaceflight Private spaceflight | Add to Reading ListSource URL: www.gao.govDownload Document from Source WebsiteFile Size: 601,87 KBShare Document on Facebook |