Thanks for the information!
I don't know if this has been discussed before, but don't anyone think it is a bit superfluous to have archery and melee promotions attached to helicopters, modern armor and mech infantry? I think when you upgrade to those units you should have a choice to exchange those promotions to others for a small amount of money. I heard once in a history lesson that when the Italians fought in Ehtiopia in WW2 they were beaten by spears and stones. That story might be exaggerated, but with even more modern units, they would never train fighting against axes and arrows, would they?