Acoustic Crowd Control

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(There's a picture of this device about halfway down the page...)

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http://www.amc.army.mil/amc/rda/scitech/library/summer00/sum00.htm

Survivability and Force Protection. TACOM's new GAYL Blaster is sure to
be a head-banger. An Adverse Audible Acoustic Device (A3D) source
employing synchronous and non-synchronous acoustic energy providing
non-lethal effects, but is a viable crowd deterrent, particularly for
enclosed areas. Device can be vehicle mounted or hand held as shown
using a 6 amp, 12 volt, power supply covering a wide or narrow beam
broadcast area with a 50 meter standoff capability. Hearing protection
provides little or no utility as a countermeasure.

Developer: U.S. Army Tank-automotive and Armaments Command (TACOM),
Armament Research Development and Engineering Center (ARDEC), Picatinny
Arsenal, NJ 07806
Point of Contact: Mr. Harry Moore, COM:(973)724-7932, DSN: 880-7932