AUVSI: Northrop Grumman gets ready for HALE air-to-air refuelling

Global Hawk formation refuelling

Northrop Grumman has flown two RQ-4 Advanced Concept Technology Demonstration (ACTD) Global Hawks in formation under its KQ-X programme to develop the concept of air-to-air refuelling for high-altitude long-endurance (HALE) UAVs.

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