Biologist
Emperor
I agree that it doesn't make sense for an XCOM squad to be involved in international wars, but... it's not like Civ tries to be deadly serious. Even XCOM doesn't really do that, when you can have your soldiers with garish armor and hair colors. Besides, someone will likely make a mod to remove the XCOM squad from the game if you don't want it. Assuming it actually exists.
That said, a scenario where you play as one of the Council nations and have to work with XCOM to defeat an alien/GDR attack would be pretty fun.
That said, a scenario where you play as one of the Council nations and have to work with XCOM to defeat an alien/GDR attack would be pretty fun.