US taps Raytheon, Lockheed and Northrop for hypersonic defense

US defense giants Raytheon, Lockheed Martin, and Northrop Grumman have been awarded contracts to develop missiles that could protect the United States from hypersonic attacks, the Pentagon announced Friday. Hypersonic missiles, like traditional ballistic missiles, can fly more than five times the speed of sound (Mach 5). But they are more...

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