Howdy all!
As per post title, I've got some ideas for CM.
Buddy Aid/Medics: Buddy aid is the go to method for simulating medics and evacuation of wounded. Let's go deeper with that. How about buddy aid being less effective. Bandages and morphine only go so far. Allow buddy aid to temporarily stabilize certain wounded soldiers (those with minor or medium wounds.) Heavily wounded soldiers, on the other hand, have to be treated with specialized medic units. Even so, create an algorithm so the soldiers can bleed out and die even if treated by medics.
Tracer ammunition: Tracers ought to be limited to crew mounted MGs and heavy weapons. Make small arms tracers an optional loadout for rifles and LMG's. Squads without tracers will be harder to spot by the enemy and have a slight decrease in accuracy. Squads with tracers are the opposite: increase in accuracy, but easier to spot. Make all of this optional for the player (I suppose some people wouldn't like this.)
ROF for Garand/Carbine: ROF ought to be higher for Veteran and above with these weapons.