The U.S. Navy uses sonar and explosives for training purposes in the waters of Hawaii and Southern California. The use of the sonar and explosives will deafen and even kill whales, dolphins and porpoises as they use sound waves to communicate with each other, locate food sources, and orient themselves in marine environments. The death of one killer whale of reproductive age can endanger the existance of the whole species.
The National Marine Fisheries Service has issued permits to the U.S. Navy allowing them to test and train in the Pacific Ocean.