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North American P-51 Mustang North Carolina (lớp thiết giáp hạm) Northrop Grumman B-2 Spirit North American F-86 Sabre Northrop F-5 Northrop Grumman RQ-4 Global Hawk North American B-25 Mitchell North American F-100 Super Sabre Northrop P-61 Black Widow Northern Premier League 2014–15Tài liệu tham khảo
WikiPedia: Northrop_Grumman_RQ-4_Global_Hawk http://defense.aol.com/2012/01/27/air-force-to-cut... http://www.armyrecognition.com/january_2014_global... http://www.aviationnow.com/Article.aspx?id=/articl... http://www.aviationnow.com/avnow/news/channel_aero... http://aviationweek.com/defense/germany-may-revive... http://www.aviationweek.com/Article.aspx?id=/artic... http://www.avionews.com/index.php?corpo=see_news_h... http://www.bloomberg.com/news/2011-06-06/pentagon-... http://breakingdefense.com/2014/09/freeing-the-hos... http://edition.cnn.com/2012/06/11/us/maryland-dron...