The Weapon of Sound: Sonic Canon Gives Pirates an Earful / SPIEGEL, 15 Nov 2005

http://service.spiegel.de/cache/international/spiegel/0,1518,385048,00.html
"Around 300 LRADs are in currently in use in Iraq. The US Army even uses the sonic cannons to clear houses acoustically. The dish can even be used as a super megaphone -- enabling soldiers to warn drivers over 300 meters ahead of checkpoints. Recognizing the potential, police in New York and Boston have also purchased a few of the $30,000 devices."