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Edwards, Calif. – ED13-0266-013- Sierra Nevada Corporation, or SNC, team members prepare for 60 mph tow tests of the company's Dream Chaser flight vehicle on taxi and runways at NASA's Dryden Flight Research Center at Edwards Air Force Base in California. Ground testing at 10, 20, 40 and 60 miles per hour is helping the company validate the performance of the spacecraft's braking and landing systems prior to captive-carry and free-flight tests scheduled for later this year. SNC is continuing the development of its Dream Chaser spacecraft under the agency's Commercial Crew Development Round 2, or CCDev2, and Commercial Crew Integrated Capability, or CCiCap, phases, which are intended to lead to the availability of commercial human spaceflight services for government and commercial customers. To learn more about CCP and its industry partners, visit www.nasa.gov/commercialcrew. Image credit: NASA/Ken Ulbrich