So the chat cable connecting my turtle beach x11 headset to my controller is no longer functional so I've been using the plastic cheap headset that comes with most xboxs. Most of the time I'm in party chat but this time I had no one to talk to so I was in Single Player in game chat. However I noticed some static noise coming through. I turn up the volume on my headset and as it turns out, your A.I. teammates talk to you while you are in game chat!
Talk about a fun little feature! It may not be helpful all the time but it helps add to the gaming experience.