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WikiPedia: Northrop_Grumman_X-47A_Pegasus http://www.air-attack.com/page/28 http://www.airforce-technology.com/projects/x47/ http://www.aviationweek.com/aw/generic/story_gener... http://www.darpa.mil/j-ucas/ https://web.archive.org/web/20031208200749/http://... https://web.archive.org/web/20090210032741/http://... https://commons.wikimedia.org/wiki/Category:Northr...