Beyond seven acknowledged projects aimed at developing long-range, maneuvering missiles with a top speed over Mach 5, the U.S. Defense Department is working in classified secrecy on at least two more hypersonic weapon programs, industry officials say.  The mystery of the classified projects—including such details as their development or operational status and any gaps each fills in the Pentagon’s unfolding hypersonic weapons architecture—remains unsolved. But a new ...

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