Oofh... I actually learnt some shit from this when I was fact checking, which instantly gets me hooked.
I'm all for this. Assuming the entire RP isn't 'combat combat combat' then I think it's gonna be brilliant.
Nice to point out though, there are numerous lists of weapons that each of these forces would use. Considering you brought up an M1 Garand, a WW2 weapon as an example of the Alliances main firearm indicates you may need to find some of said lists.
Heh.
Now then... German or Australian... Hmm...