Here's what happens when US Navy special operators go up against dolphins trained to keep them...

At the height of the Cold War, the US Navy turned to an unlikely source to protect its prized warships: dolphins and sea lions.

Beginning in the 1960s, the Navy implemented the Marine Mammal Program to defend ports and the important ships berthed there, especially nuclear-powered aircraft carriers and nuclear-powered ballistic-missile submarines, both of which are key to US power-projection and deterrence.