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Envisioned as an unmanned, reusable hypersonic intelligence, surveillance, and reconnaissance (ISR) aircraft, the much-touted SR-72 could, in theory, reach speeds of Mach 6 –...
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Envisioned as an unmanned, reusable hypersonic intelligence, surveillance, and reconnaissance (ISR) aircraft, the much-touted SR-72 could, in theory, reach speeds of Mach 6 –...