This^
Rear echelon troops are exactly that; rear echelon troops. They shouldn't be that combat effective. If anything they should be given a M12 Trench gun for better close to mid range efficiency, but they should only be good for defending. Not attacking.
They have basic combat training, that's nothing compared to what riflemen recieve.
You seem to be the only poster who is on topic. This thread is about adding a shotgun with a defensive activated ability to fire a large blast to replace volley fire because the ability is so nerfed it's not worth salvaging.
Something like 30 munitions to do a small Greyhound style canister shot that will also suppress briefly. Of course it shouldn't be very lethal, but just be a way to deter a unit.