Its called Friendly fire guys (or fraticide I believe). Good WW2 example would be operation Cobra, Americans even managed to kill a General in the opening bombardment.
You wont find many good sources for this trouble because it is something that the military suffers over and naturally doesnt talk about freely.
I can see friendly fire being more harmful to us as opposed to them, why, cause our guys are assuming we are not getting shot at by us. The enemy though is not inclined to walk into it.
Think this is simplistic, think its unfair, well I guess ordinary gamers might see it that way. The truth is far from palatable though. It might be a design flaw, but likely a flaw that captured reality by mistake in this case. If Steel Panthers is to be fun to me it has to be brutally real. Otherwise why arent you playing a silly shooter game.
If you dont want your pixel guys shooting at your other pixel guys do something about it (to many ways to see that done than I want to waste time on). Remember those pixel guys are pixel guys. Not that it matters. I have seen guys get killed in the real world from real world guys that were merely confused about who they were shooting at. Even in todays modern hi tech world people are not immune to tragedy. Most of the Gulf War casualties if my info is correct, were killed by us.
I LIKE that my life bothers them,
Why should I be the only one bothered by it eh.