IE, likely not ares related, although I am using it.

[MRMIdAS]

so it works in non-exe-hacked YR, give them the following:
[Arabs]
UIName=Name:Arabs
Name=Arab Union
Suffix=Soviet
Prefix=B
Color=DarkRed
Multiplay=yes
Side=ThirdSide
SmartAI=yes

works fine in other gamemodes, not assault for some reason.