For aesthetic alone; Soviet combat frogmen . But also, they heroically worked in mining operations, bridge building operations and counter espionage missions. Should definitely include an engineer and maybe TNT charges from Stalingrad even if they are useless.
But also, they are a major faction in game without a spec ops squad.
ASIDE from the USA (could include Merril’s Rangers in the Pacific or the Rangers in Normandy).
Major inspiration for my post - Soviet Combat Divers in World War II by Pavel Borovikov
I was also thinking they could do a more “dressed down” version but maintaining some of the froggy elements such as suit, but perhaps scuba head gear unequipped? They did river bank incursions so it is not A-historical Also, will update once I finish book with the kind of fire arms they were known to use. I already know a suppressed Nagant revolver or even an Mosin style obrez would be appropriate for sidearms.
But we’d need an entirely new game mode for it to make sense: very large scale battles.
So those specialised infiltrator squads would make sense (different behind enemy line spawn mechanic?), along with the very, very much requested apc vehicles.