Easy enough for most high school students to make one for about 50 bucks. Maybe not as powerful or sophisticated, but still effective at close range. Or, how about a device that is small enough to put in a purse that, when plugged into any electrical outlet, could destroy all the electronics in the building? Or one, mounted under a car hood or trunk, could wipe out the electronics in the car(s) in front of or behind You (any ham experimenter could make these)? All this exotic stuff isn't so exotic with todays commonly available technology and can be constructed (on a smaller than military power scale) by anyone with junk and scrap parts. The military stuff is basically the same thing, just on a very much larger scale. But keep this between you and me ... wouldn't want to give a terrorist any ideas.