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Aerial refueling technology is central to the debates about UCLASS because larger fuel tanks affect the size, shape and contours of the body of the aircraft and affect its stealth properties by changing the radar cross-section of the aircraft. Some design proposals for UCLASS would make the drone less stealthy and less able to carry a larger weapons payload – yet be able to travel very long distances as an ISR platform. Other proposals focus more on stealth and weapons payload.