Maybe in Normandy, Stalingrad, Moscow. With civilian clothing that looks worn, and a mix of random weapons such as Kar98s, Stens, and various weapons.
Yugoslav Partisan squad would be a nice addition
They didn’t really have much of their own weaponry production during the war, but they either were given firearms by allies. Such as stens, bren guns, chauchats, mosins, PPSH-41
Or they would take whatever gun from their enemies such as kar98, MP40, carcano carbines
We dont have Yugoslav campaign and …well, due to the course of war that happened in the Balkans i doubt it would be realistic trying to balance it out
But i would see Yugoslav partisans be the best fit for either Moscow or Moscow campaigns
Edit* Moscow or Berlin campaign