Women are now on US Navy Submarines (only officers though, but that's a start). I remember back in 1994 when women were first allowed on combatant ships. Thank you to all those who went before to pave the way for others to follow.
Enlisted Naval Submarine Service Device. Earned after rigorous training and testing. Indicating that a sailor is submarine qualified. When a sailor says, "I earned my Dolphins," know that he has trained harder than he has for anything else in his life.