Canada and the U.S. have always seen our border differently. That's why you speak to immigration officers going into the U.S. and they ask who you are and where you're going, and in Canada they're customs officers and they ask where you have been and what you are declaring.
NORAD is so important because it takes those national caveats on how we see the world and how we see the threats, and, as Jim states, we get the North American picture. It's an education process on both sides of the border. I think it is really important. From the information we get, from the training opportunities, and from the ability for them to understand us and vice versa, it's essential.