Request help with adding new nations

[Redbear]

I'd appreciate some help from the experts out there. I have been experimenting with adding traffic for nations not in the original SH3. I installed the flag.dat file from the nationality mod, created a new roster folder (in this case Ireland), populated it with some ship .cfg files (all already in my game), updated the DefSide to make them neutral, and added random units in the .rnd file.

My problem is this: When I go to the Museum to see if it seems to have worked, sure enough Ireland is there as well as all the ships. BUT, half of the ships have the Irish flag, half of the ships show no flag at all. What have I done wrong that would cause some ships to not show a flag? I assume if the flag doesn't show in the Museum it won't in the game - is that a correct assumption?

Any help would be appreciated. Thanks and good hunting!