Northrop Grumman RQ-4 Block 20 Global Hawk UAV ready to roll

Northrop Grumman RQ-4 Block 20 Global Hawk

Northrop Grumman is preparing to undertake the first taxi tests with the larger and upgraded RQ-4 Block 20 Global Hawk unmanned air vehicle, following the aircraft's official unveiling on 25 August at the US Air Force's Plant 42 in Palmdale, California.

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