Ball turret!
It was a primary target for German fighters. Unlike the tail position, the ball turret gunner could not move at all to get out of the way, the tail gunner could duck if he though his position was about to get wacked. The ball turret had to be in just the right position for he gunner to get out, and if it got stuck, he was in serious trouble.
Finally, the ball turret gunner could not wear his parachute while in the turret. This meant that if the plane was shot down, he had to align his turret (impossible if the electrical system is out), open the hatch, climb out, put on his parachute, and then get to an exit. Try that in a plane that is spinning faster and faster as it goes down!
The ball turret was the most dangerous position without a doubt, and everyone knew it.
=S=
Lunatic