The U.S. Air Force is looking to ramp up the Falcon hypersonic technology program to include an extra “boost-glide” test vehicle, amid signs of a growing belief within the service that routine air-breathing operations in the Mach 5-plus speed regime could soon be attainable. The Falcon program, a joint effort by the Air Force and the Defense Advanced Research Projects Agency (Darpa), is developing and demonstrating hypersonic technologies aimed at fielding a global-reach hypersonic ...


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