At the Canadian Bomber Command museum in Naton, Alberta, south of Calgary they did a good job of telling how it was. There was an article of a Lancaster bomber with the tail gunner position totally broken off with the plane still landing sans the tail gunner.
There was a joke about a crew reunion with the crew sitting together at a rectangular table but the chair at the end held a man that was facing backwards away from the table. "Who's that?" the pilot asked. "That's Smith, the tail gunner" said the navigator.