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アメリカが極超音速滑空弾(hypersonic conventional strike weapon)開発キャンセルしたのは予算不足だからだよ

US Air Force kills one of its hypersonic weapons programs By:�Valerie Insinna
https://www.defensenews.com/smr/federal-budget/2020/02/10/the-air-force-just-canceled-one-of-its-hypersonic-weapons-programs/