military has been researching ways to achieve a rapid strike capability. "That not only brings a whole set of responsiveness to the warfighter, it also, at those speeds, enhances the survivability of those systems as they overfly enemy territory," Brink said. ![]() (The speed of sound at sea level is about 762 mph, or 1,226 km/h.) There are obvious advantages to ramping up to hypersonic flight, which is generally defined as anything that reaches at least Mach 5, or five times the speed of sound. ![]() ![]() Typical cruise missiles travel at around 500 to 600 mph (800 to 965 km/h), Brink said.
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