I agree with your thinking; both of you. White British-men were pretty much the only ones fight for Britain. That's the way it worked. The British fought for Britain. And ladies fought for woman's suffrage.
I agree with Eliza though. We haven't seen a single female enemy except the Hive Queen. That brings up an intriguing subject. The arthropod/insect-based enemies have been grouped together, like they're linked by a hive mind, but I think we need some that actually
are linked. If you attack their leader, the whole nest turns on you.