If the United States stepped back from NATO, could a Commonwealth naval approach replace it?
Short answerA Five Eyes framework would be more plausible because its existing intelligence relationships could support combined command and control.
NotesA Commonwealth defence structure would not be the natural response to a US retreat from NATO. Five Eyes is a more plausible foundation because intelligence cooperation already supplies one of the hardest requirements for combined operations. Information sharing becomes a prerequisite for credible coalition command rather than an administrative afterthought.