Sir, our principle partner in the defence of North America is the United States. We maintain a very active relationship with the other two commands that are involved in the defence of North America, those being NORAD and USNORTHCOM. The structure that we use is called the tri-command. We meet twice a year, with the staffs continually engaged between the three commands to work through matters of mutual interest. We share our contingency plans together, we exercise together, and we meet frequently as leadership.
I represented my commander at Admiral Gortney's—the new commander of NORAD and USNORTHCOM—recent commanders' session down in Colorado Springs. That's just an indication, a reflection, of the degree of closeness that we maintain through the tri-command with both NORAD and USNORTHCOM. I think we share our perception of threats; we share our understanding of what each of our capabilities are. Through our exercising together, we learn how to optimize our responses and maximize our capabilities.