AUDIOPHOTO: NASA/AFRC, E61-07109 · PD-USGOV (NASA)
AviationScience & SpaceDOCUMENTED
X-20 Dyna-Soar: The Cancelled Boost-Glide Spaceplane
McNamara killed X-20 on 10 December 1963 for mission definition—not because boost-glide physics suddenly died.
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