By 2020 the U.S. military plans to release Switchblade, an unmanned, shape-changing plane concept under development by Northrop Grumman. In its standard configuration, Switchblade can maintain sub-sonic speeds for up to 15 hours, while it can fly at Mach 2 toward a target up to 2,500 nautical miles away in its alternate formation.
via popular science
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I can't wait to see one in flight.