United States Navy Miniature Submarine Warfare Insignia
Criteria: The Submarine Warfare Insignia (also known as "dolphins" or "fish") is a uniform breast insignia worn by enlisted men and officers of the United States Navy to indicate that they are qualified in submarines. The Submarine Warfare Insignia is considered one of the Navy's three major warfare pins along with the Surface Warfare Badge and the Naval Aviator Badge. To earn the right to wear the pin, 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.
Originally, the submarine insignia was to be worn by officers and men qualified in submarine duty only when attached to submarine units or submarine command organizations. The right to wear the pin was revoked if the service member transferred to a non-submarine billet. In 1941 the Uniform Regulations were modified to permit a service member to wear the submarine insignia for the duration of his career, once so authorized.