Every once in a while I have had this happen to me.  When rolling from a base that is under close attack I have been hit by the field ack...not a bandit, but from my own field ack.  I know this for a couple of reasons:
1)  The bandit(s) were not near my plane nor point in my direction.
2)  When I died, no enemy was awarded the kill.  I just received the "You were killed" message (or whatever it says).
3)  Had this happen offline as well.
I don't have film because I don't record that much and it happens so rarely that I don't want to record "just on the chance".  In my recollection this has only happened to me (online) perhaps 3 or 4 times in AH2 and never in AH1.  Offline, it has only happened once or twice (again, in AH2, but not AH1).