I'm not sure what to think about this, should the US and it's citizens worry?
This is one of those things that I say you can't prepare for, pretty much nuclear conflict and war is a disaster all the way around and you really are not going to survive through it.
Even if you survive a nuclear attack you won't survive very long because everything is in ruination and there's no chance of ever again having any type of normal life. So do we prepare to die or prepare to try and survive but died anyways?