To exploit fully the unique operational capabilities of current and future Unmanned Aerial Vehicles (UAV), and to undertake training necessary for the safe conduct of UAV operations, European military authorities require UAVs to be able to access all classes of airspace and to be able to operate across national borders and FIR/UIR boundaries. At the moment most military UAVs are restricted to segregated airspace or they are flown under special arrangements over the sea. On some occasions, operations in an extremely limiting environment are permitted outside segregated airspace.