Mr. Chair, I thank the member for her question.
Of course, the territory is huge. NORAD's area of operation is global, not limited to North America. Indeed, our aerospace warning mission actually covers the whole world. We need to know where the missiles are being launched from, so that we can establish a possible trajectory and warn both governments of this threat.
So we use assets that are provided to us by the space commands in the United States, as well as assets that are provided by the director general of space in Canada.
We monitor, globally, the particular threat associated with the air domain. Obviously, the traditional approach is to focus on the north, but there is also a focus on the east and west of the continent.
The over-the-horizon radars allow us, through their technology, to have a view of the airspace at distances that are at least a dozen times wider or longer than what we currently get from the North Warning System.
We have also sought to define the radar structure we need to meet our requirements. The U.S. government, in its budget estimates for the current year, has budgeted for the purchase of four radars, which will allow for the positioning of a radar on the east, south and west coasts as well as in Alaska. These radars, combined with Canada's likely contribution to the north, will give us a command and control architecture, as well as viewing and detection architecture that will allow us to meet future requirements.