[kach22i]

Air Force Plots $75 Million Microwave Weapon Push
By Noah Shachtman January 17, 2008
http://blog.wired.com/defense/2008/01/air-force-plots.html

The Air Force Research Lab is starting a new, long-term, $60-75 million project to develop high-powered microwave weapons, for both "airborne and mobile ground based systems." That's on top of a "near-term" Air Armament Command effort to use microwaves "as a Counter Electronics payload that would not cause physical damage to buildings or harm to humans."

I bet it takes too much energy to vaporize humans, cheaper to cut communications and other weapon systems (like cell phones for road side bombs).