The U.S. has had several opportunities over the past 50-plus years to move beyond experimentation and demonstration in hypersonics into research and development of operational systems. But technical challenges and test failures, start-stop funding and the absence of clear and consistent requirements from government customers have put the country at risk of losing its hard-earned leadership in hypersonics.​ 1947     National Advisory Committee for Aeronautics 11-in. hypersonic ...

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