The Second Amendment covers ARMS. That means all of them- machine guns, grenades, artillery, jet fighters, naval warships, and yes, even nukes.
If you disagree that the 2A includes nukes, you don't simply redefine the words of the COTUS, that is the same thing that the Brady bunch does now. The founders had a method for changing the Constitution: the Amendment process. I am sure that 3/4 of the state legislatures would have no problem passing an Amendment that exempts nuclear weapons from the Constitutional definition of arms.