This kind of LEMP weapon could be theoretically deployed as an air defense system to neutralize conventional (IR guided or radar guided) missiles, but could also be used to neutralize UAVs, which are dependent on electronic systems.

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While this means they have a similar role to the guided missile cruisers, destroyers are smaller and faster and are designed to reduce their profile on enemy radar - though it is unclear whether this technology is successful.

BBC: News | In Depth | Military Fact Files