That stands for "vertical take off and landing", not in the way that a helicopter does, but more like the tilt-rotor V-22 Osprey in the U.S. military inventory. As the U.S. Air Force is moving toward a greater role for unmanned aircraft, the Excalibur could have a production future:
http://www.popsci.com/military-aviation-amp-space/article/2009-07/unmanned-hover-aircraft-takes-first-flight (where you can find a video of a 1/2 scale version in flight)
The unmanned aerial system (UAS) could pack a 400-pound payload of four Hellfire missiles, and also deliver weapons or other supplies to warfighters deep in rough territory. Its design allows it to have a maximum speed of 460 mph, but also have the ability to loiter overhead at just 115 mph.
http://www.popsci.com/military-aviation-amp-space/article/2009-07/unmanned-hover-aircraft-takes-first-flight (where you can find a video of a 1/2 scale version in flight)
Not having to leave room to stash the pilot sure makes things easier!
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Its a hunter killer.
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I wonder if unmanned army vehicule, aka no friendly un-PC casualties, would lead to more conflicts?
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But can it eat people for fuel?
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