I have just a quick question for you. We've talked a lot today about the fact that the air sovereignty mission in the north is only one of the missions of the F-35, and it's probably, relatively speaking, one of the most benign missions of the F-35 compared to the other things it gets involved in in places like Afghanistan and so on. Would you have a short comment on how air sovereignty or sovereignty generally is largely about just being there?
If we're going to say that we're exercising sovereignty and if aircraft that have not filed flight plans are operating within our air defence identification zones, we have an obligation under NORAD and under common sense to exercise air sovereignty and just be there so that they can see that we are there and we are exercising it. Would you comment on that?