Despite an accelerated and deep road map for U.S. hypersonic weapons technologies, the Defense Department’s fiscal 2020 budget request shows that the path beyond operational flight and weapons prototypes is still long and uncertain.  Between six and 10 hypersonic vehicle programs—depending on how they are counted—are funded in the budget request, says Mike White, assistant director for hypersonics to the undersecretary of defense for research and engineering. ...

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