It's a bird! It's a plane! No! It's the Defense Advanced Research Project Agency's (DARPA) Mach 20 aircraft, and apparently, that pesky glider is so fast that it's rather difficult to track. DARPA ...
If all goes well, the Pentagon this week will test an unmanned aircraft that, in theory, can travel at speeds upwards of 13,000 miles per hour and send a missile to strike an identified target within ...
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