The United States Strategic Nuclear Triad is still in place with 18 Strategic Ballistic Missile Submarines, 450 Minuteman Intercontinental Ballistic Missiles and God knows how many B-52 and B-2 bombers. We have an agreement of some sort with the Russians now and so our missiles are not pointed at Russian cities anymore. Of course, they never were. The missiles are all pointed straight up. They can be targeted as rapidly as you can punch a location in your GPS.
So that's what the end of the world looks like from a sailor's point of view.