Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff, said China’s test of a hypersonic weapons system is “very concerning” — and “very close” to a Sputnik moment as Beijing rapidly expands its military capabilities. As The Washington Post has reported, national security officials were alarmed by the suspected test in August of a nuclear-capable hypersonic vehicle that partially orbited the globe before hurtling toward Earth. As China is in the midst of a rapid expansion of its strategic and nuclear weapons systems, its demonstration of hypersonic and orbital capabilities — first reported by the Financial Times —...