PICTURES: Skunk Works reveals Mach 6.0 SR-72 concept

PICTURES: Skunk Works reveals Mach 6.0 SR-72 concept
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Lockheed Martin's Skunk Works is proposing to develop a new aircraft for intelligence, surveillance and reconnaissance (ISR) missions that is capable of Mach 6.0 flight, or nearly twice the top speed of the long-retired SR-71 Blackbird.

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