Mid-air retrieval
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Lockheed D-21
Lockheed X-7
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Lockheed A-12
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Museum of Flight
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M21
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1960 U-2 incident
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Unmanned aerial vehicle
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Lockheed SR-71 Blackbird
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Skunk Works
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Tupolev Tu-144
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Ramjet
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CIM-10 Bomarc
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Area 51
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D-21 drone
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