One day, for one reason or another, Uncle Sam may have to turn GPS off. And he probably won't want to issue a NOTAM until after he's done it...
A oft repeated scenario, and totally without merit.
It wasn't turned off after the events of 11Sept01, so it absolutely will not happen.
Most Europeans have a mental hangup about this, so perhaps the US DoD should start charging our European friends for the use of the US system.
A user fee for the non-believers...which didn't pay for the installation and continued operation of the system in the first place....