In Elmer Bendiner's book, The Fall of the Fortresses, he describes a bombing run over the German city of Kassel:

Our B-17 (The Tondelayo) was barraged by flak from Nazi antiaircraft guns. That was not unusual, but on this particular occasion our gas tanks were hit. Later, as I reflected on the miracle of a twenty-millimeter shell piercing the fuel tank without touching off an explosion, our pilot, Bohn Fawkes, told me it was not quite that simple.

On the morning following the raid, Bohn had gone down to ask our crew chief…