Why would we? It seems the only reasonable place to wage war. Much better, at least, than on land occupied by people.
We'll spend it on some other ill-advised "peacekeeping" venture. The intent may well really be peacekeeping, but frankly that's moot if the results aren't peace.
If a country could control space -- as in destroy all satellites that they don't sanction, or require 'taxes' for satellites, could be hugely profitable endeavor as well for the country. Space itself is a resource.