In Memphis Belle the bomber force is ordered to circle back to the Initial Point when the Primary Target is obscured by smoke or cloud cover. In reality, this would NOT have happened. First, it is VERY hard to have a formation of 300-plus Forts make a 180 degree turn. Second, such a maneuver would alert all flak batteries as to the actual target. Third, such a maneuver would keep the force under fighter attack longer than need be. In actuality, bomber crews were briefed on a primary, a secondary, a tertiary and targets of opportunity. If the primary target was unable to be hit, the primary became the IP to set up on the secondary. If the secondary were unable to be hit, it became the IP for the tertiary, and if that were unable to be hit, the force commander (NOT the pilot of the lead aircraft) would issue an order to go after targets of opportunity. Failing that, the mission would be aborted and the crews would dump their ordnance in either the North Sea or the English Channel. The mission would count toward tour completion, as the crews would have been in combat, and were over enemy territory.