can leaders become better?

[Revenant]

I have one question concerning the quality of leaders when the unit get experience rank in campaign(normal-veteran-elite...)

Do their abilities improve ?

Now I am talking about the command rating(inf, art, armour) and rally. I remember that in the original SP game their rating stayed the same, but in my current campaign as USSR, I think the more experienced units have better leaders as the time progress. I do not keep notes so far though.