Around the world, many militaries have trained combat dolphins to perform dangerous tasks, like locate underwater mines.
The Russian Navy, for example, once trained dolphins and other aquatic mammals to attack warships and enemy combat divers. For over 50 years, the US Navy also trained dolphins and sea lions for various missions. In 2014, the US Navy announced plans to replace its Marine Mammal Program with a "new generation of robotic mine hunters," starting in 2017.