The u.s. air force (USAF) at the air force base Grand Forks, North Dakota took over first unmanned aerial vehicle RQ-4 Global Hawk Block 40 Northrop Grumman. This military base after Beale becomes the second main operating base, from which it will be unmanned aerial vehicles act.
Source:
http://www.letectvi.cz/letectvi/Article71426.html.
Source:
http://www.letectvi.cz/letectvi/Article71426.html.