Being able to swim when stationed on a ship sounds way more useful than it actually is. In a 'man overboard' situation, it doesn't help you much, you get fucked by the inertia of a massive ship that can't just turn around and pick you up. By the time they manage to turn around the ship, the real problem is actually finding you. Even if you're an excellent swimmer, your chances of survival are very low.
Being able to swim when stationed on a ship sounds way more useful than it actually is. In a 'man overboard' situation, it doesn't help you much, you get fucked by the inertia of a massive ship that can't just turn around and pick you up. By the time they manage to turn around the ship, the real problem is actually finding you. Even if you're an excellent swimmer, your chances of survival are very low.