[dogscoff]

QUOTE:
It agrees with another phenomenon I've encountered: if you find a 0 pop colony that belongs to another race, you still have to land a troop to take control of it; you can't just drop your own people there.
/QUOTE

You could just say that troops are needed to eliminate any booby traps and security systems left behind by the previous occupiers.

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"Pinky, are you pondering what I'm pondering?"
"I think so Brain but, if you replace the P with an O, my name would be Oinky, wouldn't it?"