Well, part of the issue is in regards to using active sonar and the damage it causes to marine life, especially cetaceans. There have been legal proceedings in the US restricting the use of active sonar in some areas, the Navy has been trying to remain sensitive to the issue and has curbed it's use somewhat. There are number of citations both for and against it's use on the 'net...
Can't ping 'em, can't find 'em...
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