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This Nov. 11, 2017 photo provided by Sierra Nevada Corporation shows the Dream Chaser spacecraft being lifted by a helicopter prior to a test flight at Edwards Air Force Base, Calif. The Sierra Nevada Corp. says its Dream Chaser had a successful free-flight drop test in the Mojave Desert on Saturday, Nov. 11, 2017. (Ken Ulbrich/NASA via AP)

This Nov. 11, 2017 photo provided by Sierra Nevada Corporation shows the Dream Chaser spacecraft being lifted by a helicopter prior to a test flight at Edwards Air Force Base, Calif. The Sierra Nevada Corp. says its Dream Chaser had a successful free-flight drop test in the Mojave Desert on Saturday, Nov. 11, 2017. (Ken Ulbrich/NASA via AP)

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