There is no line item conveniently labeled “SR-72” on which to hang the Pentagon’s renewed interest in hypersonics, but a comb through its fiscal 2019 defense budget request shows an uptick in funding for high-speed weapons and a shift from research to maturing systems for operational use. Fiscal 2019 is poised to see first flights of the Defense Department’s two high-speed flagships; Tactical Boost Glide (TBG) and Hypersonic Air-breathing Weapon Concept ...

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