I'm not sure if it says it in the article or not(I didn't read it), but depending on what information you believe that has come out, anywhere from 1-40 Vietnamese enemy divers have already been killed by them.
Stephanie Boyles, a marine biologist and spokeswoman for People for the Ethical Treatment of Animals, said that sea mammals do not provide a reliable defense system, and that they should not be kept in small enclosures.
"We believe the United States' citizens deserve the very best defense possible, and this just isn't it," Boyles said
PETA continues to amaze me. Like if they would expect any sane person to believe that they would know anything about what would make a good "defense system".