Mastodawn

»the two pilots, the front gunner, the navigator, and the wireless operator« and a rear gunner.
The crew of a Wimpy, according to Winds of War

»a pilot, radio operator, navigator/bomb aimer, observer/nose gunner, tail gunner and waist gunner.«
Crew of a Wimpy, according to Wikipedia.

I don’t know why, but the #RAF didn’t really believe in copilots for the longest time.