As Northrop Grumman rolls out its first Global Hawk Block 40 aircraft, the high-flying unmanned aerial vehicle (UAV) program is facing some hurdles. The Office of the Secretary of Defense and U.S. Air Force are ironing out particulars of a delay to the initial operational test and evaluation (IOT&E) period for the Block 20/30 Global Hawk. Industry and government sources suggest it is likely to be nine months; the original plan was to start IOT&E in August and wrap up in ...

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