This mod looks great. Good job Manteuffel.
FTR: I only gave limited technical assistance. I'm seeing the flags for the first time, so I've no vested interest in the flag design.
Poland's Flag
AFAIK the Polish flag with shield is the government's flag in exile, not a naval flag. This was discussed here:
http://forum.shrapnelgames.com/showthread.php?t=46772
Japanese (centred sun) and German Flag
The modded flags are army flags.
SP normally uses national flags (USMC excepted), probably because quick and easy recognition is a high priority.
Some may think it incongruous to have some army flags and some national flags, but that's why this is a mod, it's whatever you'd like to see on the battlefield. And certainly the troops themselves often used a variety of flags.
The British Army flag (red with two crossed gold swords) was rarely used on the battlefield. Perhaps that's why I personally prefer the traditional Union Jack.
Cross
Re: Flag Mod
Threaded Mode