That's fantastic.
The answer is still being developed.
You're actually right, in that I think it would be a mistake to assume that radars are going to replaced one by one at exactly the same locations. I talk about a system of systems, and it may be that we're going to find ourselves in the configuration where we're going to have advanced technology with sensors and radars that can be further south but that will be able to look way further out in the north.
That's what I mean by replacing a capability with a modern capability. It's not necessarily a one-for-one replacement. It's not necessarily about using the same location. Really, it's about exploiting the latest technology in order to improve our way to sense, detect, and track whatever is coming.