Gilgamar, if you search the forums you can probably find a post by me where I linked to articles about those microwave guns.

Their main designed use is riot control. They can actually spread them out in a very wide area.

They gun works just like a microwave oven, basically. It excites water molecules (of which there are a lot in your body) to make you very uncomfortable. The degree of discomfort can range from mildly irritating to painful enough that you fall to the ground in agony. It is non-lethal and the results are temporary.

The military wants to use them for things like protecting embaassies abroad.