Hypersonic weapons close in on their targets at a minimum speed of Mach 5, five times the speed of sound or 3,836.4 miles an hour. They are among the latest entrants in an arms competition that has embroiled the United States for generations, first with the Soviet Union, today with China and Russia. Pentagon officials tout the potential of such weaponry and the largest arms manufacturers are totally gung-ho on the subject. No surprise there. They stand to make staggering sums from building them, especially given the chronic “cost overruns” of such defense contracts -- $163 billion in the far-from-rare case of the F-35 Joint Strike Fighter.
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