It can be done selectively, "Privileged" users will not be disrupted.
Actually, that is wrong!
"First strike" strategy was never about randomly incinerating cities. It was about destroying the "Enemies" ability to retaliate.
If you are trying to destroy a serious nuclear grade bunker, accuracy is crucial. Even with a megaton range weapon. 100M off target, (Even 50M) will fail to do the job.
Correct . The US opened GPS to the public when they realized the Russians had a similarly good system.anyway, and IMUs got so accurate that GPS was not even that relevant.
The US does posses the ability to encrypt GPS again reducing but it it not likely to do it.
And they certainly wouldn't bother for Trump in the UK.