The US Navy really wants a flying stealth drone. To that end the organisation has been developing a number of prototypes, the most prominent of which is the 'UFO' styled X-47B combat demonstrator.
While looking similar to other UAV drones, the Navy definitely has the claim of it being not only the most capable, but the scariest.
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Whereas others have been limited to flying over land, the X-47B is capable of taking off/landing on a carrier, performing a range of defence and strike duties and -- most recently -- can even refuel itself using an airborne tanker.
Depending on which way you look at it however, there's some good/bad news. The X-47B is already a relic, the drone has carried out all the tests that were asked of it and it'll be sent to a museum to scare small children and mildly concern adults.
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The Navy plans to use the results from this two year experiment to shape the designs for their next prototype and eventually, their first unmanned naval fighter jet.