Hypersonic Missiles Are Unstoppable. And Theyโre Starting a New Global Arms Race.
The new weapons โ which could travel at more than 15 times the speed of sound with terrifying accuracy โ threaten to change the nature of warfare. On March 6, 2018, the grand ballroom at the Sphinx Club in Washington was packed with aerospace-industry executives waiting to hear from Michael D. Griffin. Weeks earlier, Secretary