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Some context re. reported speed of #NorthKorean #missile:

All #ballistic #missiles are #hypersonic (faster than Mach 5) at some point in their flight. N.Germany’s V-2, deployed Sept. 1944, was hypersonic during its boost phase. Intercontinental ballistic missiles (#ICBMs)… 1/n
…, first deployed by the US in 1959, are high-hypersonic (Mach 25) throughout their entire flight. Subsequent decades have witnessed the emergence of “#hypersonic#missile systems that can maneuver instead of following a fixed parabolic trajectory, including #ASBMs, #HGVs 2/n
…and air-breathing supersonic combustion ramjets (#scramjets). The US investigated maneuvering re-entry vehicles in the late 1970s, the #SovietUnion #HGVs in the mid-1980s; both failed. In 1981, the US fielded the #PershingII medium-range #ballistic #missile (#MRBM), whose… 3/n
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