U.S. Armed Forces Navy Enlisted Submarine Dolphin Pin

Enlisted Sailors and Navel Officers wear a dolphins uniform breast pin to indicate that they are qualified in submarines. The Submarines insignia is considered one of the Navy's three major enlisted warfare pins. To earn the right to wear "fish", prospective submariners complete an extensive qualification process that lasts about one year (for both enlisted and officers, though the two programs differ significantly) and covers virtually all of the submarine's systems.