SnowKomodo
Deity
It isn't "puzzle piece" however, it is a simple 2 checkbox system. 1. Did this military unit exist, Y/N. 2. Are they known outside their place of Origin, Y/N. It could not be much easier to get in, as your UU doesn't have to be primarily associated with the country that used it (Norweigan ski infantry), doesn't have to have fought many major battles (Mehal sefari), doesn't have to have been more skilled compared to their rivals (Minutemen), and doesn't have to have been used in the nations most well known time period (atlatlist) just the two checkboxes. If you can only get one of these checkboxes filled, then I'm sorry, but we don't have a unique. I sympathise with the design team on many issues, trying to fit entire countries into only a few sentences is damn near impossible, and I have applauded their work thus far. Here however I believe they have made a misstep.
Well, there isn't much more discussion to be had then. You go by your criteria, I don't (for example, I don't really understand your checkbox system). I've said everything that needs to be said in the past few pages but you seem to only nitpick a few basic concepts (hence the 'puzzle piece' statements) so I think we should just leave it here: Agree to disagree