The U.S. Navy has 75 trained dolphins to detect enemy swimmers and underwater mines.

A military dolphin is a dolphin trained for military uses. The United States and Soviet militaries have trained and employed oceanic dolphins for several reasons. Such military dolphins have been trained to rescue lost naval swimmers or to locate underwater mines.

The U.S. Navy trains dolphins and sea lions under the U.S. Navy Marine Mammal Program, which is based in San Diego, California. They get some of their dolphins from the Gulf of Mexico. Military dolphins were used by the U.S. Navy during the First and Second Gulf Wars. About 75 dolphins are in the program.

The United States Navy implemented a program in 1960 to work with dolphins and sea lions in order to help with defense, mine detection, and design of new submarines and new underwater weapons. The Navy did many tests with several marine mammals to determine which would be best for the jobs they needed done. "More than 19 species were tested, including some sharks and birds." Eventually, the bottlenose dolphin and California sea lion were shown to be the best at what the Navy needed them for. The bottlenose dolphins' asset was their highly evolved biosonar, helping to find underwater mines, and the sea lions' asset was their impeccable underwater vision, which can help to detect enemy swimmers. In fiscal year 2007, the United States Navy spent $14 million on research on marine mammals as weapons and marine mammal training programs in object recovery and mine detection and have 75 trained dolphins.[8] Dolphins have contributed to saving more lives in open water than specially trained life savers[citation needed].

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.[4]

Retired US Admiral Tim Keating claimed that military dolphins could be used to detect mines in the Strait of Hormuz, after Iran threatened to close the waterway in January 2012.[10]