And potentially others as well of course. Tagging should be an easy way to filter topics inside of a category like breaking out Japanese axis topics from German, Italian, etc.
The tags are great-britain, usa, france, italy, germany, japan, canada, australia at the moment. More can be added as needed if you are trust level 2(?) or higher.
If we had topics organized in this way we might even merge the Armorama Axis/Allied categories into one, as obviously some of them get a bit confusing depending on dates, etc.