I was a member of the 2i/c's crew on my first V sqn in the 60s, and we were known as the "Smith" crew. During my period of tenure we had 2 different co-pilots, and 2 different nav plotters, but the same AEO. Tour lengths demanded that some crew members were posted before others, but as far as radar bomb scoring and crew combat ready categories were concerned, only the captain and the 2 navigators were counted as "constituted".