I had a glitch once when I was on Kashyyyk that spawned a weird ghostly grey fifth commando. It would shoot, but not move, and when it died, it sort of deflated like a big balloon. You could revive it, too. But when I got annoyed with it and tried to shoot it, it turned out that it was somehow connected to Boss or something so when I shot it, I took damage too. Then after killing it twice, the rest of the squad came after me for team-killing.
It only happened one time, and never again since. *shrug*