Old hat Armand!
In my WWI-WWII game "The Shattered Century" there are 12 Imagi-nations though it's not hard to figure out who's being stereotyped--- Try and guess who they are.
Fahrvergnuggen
Workers Winter Wonderland of Freeland
Bandrika (this is the hardest one)
The Empire of Tirramasu
The Empire of Fu-Manchu and chain of Chinese Restaurants,
The 443rd (and Counting!) Flounce Republic.
Hungland or the Brutish Empire
The Newnited States (They'll make you a deal you can't refuse)
Tropicana
The Fascist Monarchy of Fanabla
The Sultanate of Ikea
The Grand Holy, Republican, Socialist, Democratic Dictatorshp of Putzland (Long Live Marshal Soapsudski!)
Each of these countries has its own history, army uniforms and so forth, but each also has it's own R&D Department with its own unique weapons and so forth that might appear on the battlefield.
For example Flounce has the Bimbo on a bicycle, which can be introduced to distract attention (no move or fire when she is in the immediate area) which is part of Flounce.
The Fahrvergnuggie have the Intercontinental Ballistic Canon, an enormous gun which can send shells into the upper atmosphere and across oceans. Works quite well as long as you're aiming at a continent.
The Bandrikans have the best of all. One of their weapons is the Martian Fighting Machine. Yes it's the fighting machiens from War of the Worlds. Did you know it actually happened!!! But not in Grovers Mill NJ, but it leedle ole Ost-Schweinschlobber Bandrika, where the first fall of the martians were wiped out by the smell of cooking sauerkraut and Bratwurst done up by the welcoming party (who knew the pungent fumes of Sauerkraut and bratwust were toxic gasses to the Martians? Did they ask!? Did they make Reservations? Did they let us know they were coming? Anyway the Bandrikans captured intact but unassembled a Martian fighting mchine. They put it together, but Engineering hasn't got it quite right… it works… you can use it.. it was working fine just a few minutes ago… go ahead use it, what can go wrong?
The answer on Bandrika is that it is an "omage" to Alfred Hitchcocks great film "The Lady Vanishes." A pre-war tale of espionage and skullduggery somewhere in the Balkans just before WWII. Two fo the best characters are Charters and Caldicott.
Also to the 39 Steps.