Environmental groups are urging Congress to hold oversight hearings about the U.S. Navy's anti-submarine warfare program, including the use of sonar devices. The National Marine Fisheries Service received an application from the U.S. Navy requesting a Letter of Authorization (LOA) for the take of small numbers of marine mammals by harassment
incidental to Navy operations of the Surveillance Towed Array Sensor System (SURTASS) Low Frequency Active (LFA) Sonar. we have the story on solcomhouse-

 http://www.solcomhouse.com/sonar.htm