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THE US Air Force is examining the feasibility of a nuclear-powered version of an unmanned aircraft. The USAF hopes that such a vehicle will be able to “loiter” in the air for months without refuelling, striking at will when a target comes into its sights.

But the idea is bound to raise serious concerns about the wisdom of flying radioactive material in a combat aircraft. If shot down, for instance, would an anti-aircraft gunner in effect be detonating a dirty bomb?

It raises political questions, too. To have Unmanned Aerial Vehicles (UAVs) almost constantly flying over a region would amount…

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