there's a difference between having a submarine that is nuclear powered and a conventonal submarine or surface ship that has nuclear weapons. A nuclear powered sub can stay underwater indefinatly which is a plus. A conventional sub has to surface and pollute the atmosphere running engines to charge batteries that eventuatly have to be disposed of. And actually a nuclear powered Attack sub probably doesn't even have nuclear weapons aboard. An Attack sub hunts the enemy subs that do. And a whole lot more that keeps you safe. FYI