Only to say that I think Professor Doran is right. The United States is going to react favourably to Canada. You're a good ally. If Canada exempts itself from one program, I think it's a strange lacuna to put into the relationship. It's frustrating, but it doesn't mean that the fundamental relationship between United States and Canada breaks down.
Think about missile defence not only in terms of the defence of the continent, particularly with a more aggressive Russia, an uncertain North Korea, and China, which has increasingly good ballistic missile capabilities, but also in terms of protecting the troops on the battlefield. Canada's in a forward position against the Islamic State. There are other battlefields in which even relatively unsophisticated allies, like the Islamic State, are able to get access to missile technology, maybe not full ballistic missile, but still the ability to attack our troops. Having battlefield protection is also increasingly important. That's technology Canada could contribute, whether it was from the navy or for protection of its troops in the field, if it were willing to participate more fully in these defences.