I have absolutely no idea on how they do stuff elsewhere, all that i know is from my "home" airbase..:) To answer your question, yes, when they fly up high they use the east/west flight level system, but mostly they fly normal VFR to their targets and back home under 5000ft.. When they are out of their target/practise areas they must follow all civil flight rules exept one.. minimum altitude above non-populated areas.. "Clear of obstacles".. you can imagine how jelous i am about that!!:D