Flights of the Global Hawk unmanned aerial vehicle (UAV) from Beale Air Force Base in California are on hold while the U.S. Air Force and manufacturer Northrop Grumman try to determine why the aircraft briefly lost communications with the ground during its first flight from the base last month. Beale is home to two Global Hawks, the first of which arrived in October 2004 and has been kept on the ground for maintainer training. The second aircraft, which arrived last month, is to be ...


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