I agree, one command I would like to see them follow is "hey buddy GET DOWN"
or "take cover". they just stand there and take hit after hit. I remember the first time I played the SP demo and my guys all died, I felt badly for them lol (admit it, you did too hehe)
On the first mission in the full version even if you manage to keep some of them alive they still are pronounced dead when you go to the rescue mission. It would have been cool if they stuck around to help you on the next mission.

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Why Cheat?