The late game weapon unlock: PPD40, late vehicle unlock: T-28 even though the ppsh-41 and the t-34 and kv-1 are already present at the time, the moscow 41 campaign armament for the soviets feels a lot like its fighting the winter war,
I think it that would actually be an interesting addition to the enlisted campaigns, the environment would be similar to moscow 41 so the same assets could be used, on the other side of the front would be troops wearing the similar camo outfit as the soviet recon squad armed with suomi domestic weaponry and imported weapons and vehicles from other countries received as aid as other current factions are doing as well, not to mention enlisted already contains weaponry present in little quantity at the time