Very interesting approach, and I think it works a lot.
However, I'd suggest adding these to the tech trees of (at least) Britain and Italy as well. Maybe even Russia.
Historically, US troops were committed in division sized forces to the Western Front and Italy during the War, and retained fiercely independent of both French and British command short of Joffie. So I think it makes more sense if they "straddle the line" by being recruitable by all the major Western Allies.
Turtler7
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