It is ALWAYS encrypted. The Military would have no problem shutting down only the parts civilians can decode while retaining all the other parts.
The GPS signal is not one signal but several. It is true that they removed some of the built in error to the civilian signals but no all of it because there are several types of error... I should not say much about it, but the short version is they can shut it down for everyone else but them.
They then showed me their panels. Nothing but dead reckoning and a handheld that a member of each crew purchased on their own dime just in case. I was amazed! One guy flies and the rest just follow the one who presumably knows where he's going. They cannot fly IFR.