I’m not a fan of this from a fleet composition style as well as from a cultural perspective.
Fleet Composition Reasoning:
Ships have varying strengths and weaknesses. Additionally, war is naturally chaotic. Fleets should be built around certain mission requirements, the right ships for the needs of the missions the fleet is running.
Cultural Reasoning:
This could easily slide too close to a “segregation” of cultures and open a real opportunity for a Yamataian Civil War or Secession. It’s generally bad to divide people into groups.
If you are a citizen of Yamatai, you’re Yamataian.
If you’re a soldier of Yamatai, you’re Yamataian.
It doesn’t matter where you’re from or what you look like, you’re just Yamataian.