I noticed a few small things that could be altered. For example when using the binoculars, you should first have them in your hand, not directly go to the view. It might seem pointless but having a wrist watch on your hand to look at might not be a bad idea, there were many watch manufacturers during the war that provided a wrist watch. I would think having the weapons holstered by default would look better, the process can be automated, if the player is not shooting or running to a point or walking to it.
Weapon wise I can say that none of the weapons should come with a bayonet on, it should be done so at the player’s discretion. Something to do if you are bored or want to have the experience. Could blood be added to edged weapons or do you wish to keep it more PG or have it switched on optionally.
Vehicle wise, the land vehicles in War Thunder accumulated mud, dust or got dirty, it would look very good here as well driving in dirty vehicles, shows they are active.