To talk about the last part of that first, I think the enhancement of our continental defence should definitely look at those aspects, particularly at sea. I'm a bit less clear about what the driving imperative is on land, but certainly in the maritime environment, I think we should be working as closely as we can with our American allies to make sure that the coastal approaches to North America are well secured. There's a discussion to have about who's best placed to do that, but I think the important part is that we make sure we have the means to do that, which would require moving quickly on our shipbuilding procurements.
In terms of the hypersonic issue, I think there are two parts: one, we have to have enough surveillance to be able to accurately track those particular missiles, which means we need a much more sophisticated and comprehensive ability to pick up that fast-moving and manoeuvrable potential threat; and two, we then have to look at ways of being able to at least intercept those weapons if we think they're armed with conventional warheads. There's a bit of a deterrence issue that comes into play if they're nuclear-armed, but they aren't always, at least as they're envisioned to be employed by some of the people who are fielding them. We need a better ability to intercept them if we think we need to.