The one area that Dr. Fergusson didn't have time to talk about is the maritime dimension of the approaches. He's talked very correctly about the hypersonics, but we know that Russian submarine activity has been increasing. We know that their deep diving capabilities are increasing. We've seen how they can do the cable, and NORAD has the mandate to deal with the underseas threat, but that is one area where we are really weak.
The Russians have even developed underwater autonomous vehicles that can go, allegedly, 10,000 miles and carry a nuclear warhead. Once again, these are all elements of the overall domain type of warfare that Russia now brings to the table that we ultimately and completely need to be able to detect and, as Dr. Fergusson said, respond to.