In 2005, I think we could have participated probably by simply adding some additional personnel to some NORAD sites that had part of the ballistic missile defence mission. Now, in 2014, with the intent of the Americans to deploy interceptors to eastern Canada and the need to have radar to support the proper target discrimination of an incoming ballistic missile warhead, there probably would be more interest in our providing a site in Canada to build such a radar. A site in Canada would be an appropriate spot to build one, and perhaps even some indication that Canada should fund or partially fund that.
In my view, we would not necessarily have to contribute directly to ballistic missile defence if we wanted to offer some asymmetric contribution that would be useful to the two nations, either within NORAD or in some other area, but the fundamental reality is that I don't know, and we wouldn't know until we made an appropriate approach to the Americans to explore the possibility of our participation and what they might welcome as a contribution.