no serious ordnance would rely on Galileo most use a rather nice laser (for INS)
Galileo works "in combination" with GPS and is rather easy to block again not something you want in modern warfare
the ONLY good thing is that it increases the accuracy for things like your car, tank and the ambulance Navigation system when NOT at war
which is pretty important considering the truck that takes sick people to hospital actually SAVES LIVES
(requires the PRS)
lets see how the EU gets on when it see's the NATO operations...