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X-10 Navajo Missile Prototype BI211284
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X-20 Dyna-Soar Model BI223931
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X-20 Dyna-Soar Structural Glider Design Status Diagram BI229435
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X-31 EFM/ESTOL Advanced Concept in Flight BI218686
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X-31 EFM/ESTOL in Flight BI215114
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X-32A Joint Strike Fighter in Flight BI227407
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X-32A Joint Strike Fighter Landing Tests BI227403
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X-32B Completes Government Flight-Test Requirements BI227927
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X-36 Tailless Fighter Agility Research Aircraft BI231451
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X-36 with Ground Crew BI215118
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X-37B Completes Third Test Mission, October 17, 2014 BI44722
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X-40A Space Maneuver Vehicle BI218684
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X-45A UCAV in Flight BI228085
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X-45A UCAV Maintenance BI228073
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X-45A UCAV on Tarmac BI228077
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X-45A UCAV Takes Off BI228089
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