The dolphins and sea lions are trained by five teams of the Navy's Marine Mammal fleet members. One team specializes in swimmer detection, three teams in mine location, and another team in object recoveries. The quick-response goal of this fleet is to mobilize a team and be on site within 72 hours. Dolphins are trained much as police dogs and hunting dogs are. They are given rewards such as fish on correct completion of a task. Dolphins are trained to detect underwater mines and enemy swimmers and then report back to their handlers. Rumours that dolphins had been trained to kill divers have been denied by the US Navy, which claims that training dolphins to fight or kill humans is impossible.