Vehicle-Mounted Active Denial System (V-MADS)
Non-Lethal Weapons
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Active Denial Technology is a breakthrough non-lethal technology that uses millimeter-wave electromagnetic energy to stop, deter and turn back an advancing adversary from relatively long range. It is expected to save countless lives by providing a way to stop individuals without causing injury, before a deadly confrontation develops.
The technology was developed by the Air Force Research Laboratory and the Department of Defense's Joint Non-Lethal Weapons Directorate. Approximately $40 million has been spent on this technology over the past ten years.
This non-lethal technology was developed in response to Department of Defense needs for field commanders to have options short of the use of deadly force. Non-lethal technologies can be used for protection of Defense resources, peacekeeping, humanitarian missions and other situations in which the use of lethal force is undesirable. The system is intended to protect military personnel against small-arms fire, which is generally taken to mean a range of 1,000 meters. The system is described as having a range of 700 yards.
Countermeasures against the weapon could be quite straightforward — for example covering up the body with thick clothes or carrying a metallic sheet — or even a trash can lid — as a shield or reflector. Also unclear is how the active-denial technology would work in rainy, foggy or sea-spray conditions where the beam's energy could be absorbed by water in the atmosphere.
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http://www.globalsecurity.org/military/systems/ground/v-mads.htm