You seem to be trying to give the impression that the U.S. nuclear arsenal is not the best in the world, with the best delivery systems.
Nukeland in the US is kind of a military backwater. We were into all the stuff that cost gazillions and failed to win the wars in Iraq and Afghanistan and Syria and ...
PS. A lot of this is irrelevant. Nuclear weapons don’t fight nuclear weapons so the only thing that matters is if your nukes can hit the target and detonate. other than that it doesn’t matter how old they are or the technology level.