Northrop Grumman demonstrates Unmanned Aerial Vehicle air-to-air refueling
On Jan. 21, 2011, the most well known three aircraft centers of the world, Northrop Grumman Corporation, Defense Advanced Research Projects Agency(DARPA) and NASA, Dryden Flight Research Center, demonstrated autonomous aerial refueling between two unmanned flights, on a very high altitude aircraft platforms. This kind of operation never before performed..
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