Don't kill Your Friends (1943)
 

Link below to a wartime gunnery and safety training movie. It shows that gun systems were more complicated than they are presented in the game I guess...

http://www.youtube.com/watch?v=cU2T793tNqk

The Dilbert character in the movie is a creation of Robert C. Osborn. From Wikipedia, also thought that the following is interesting:

Osborn enlisted when World War II began, hoping to become a U.S. Navy pilot.[citation needed] However, the Navy apparently decided that he would be better employed with his hand wrapped around a pen rather than around a joystick: he was soon learning, then applying the art of "speed drawing", under the command of the photographer Edward Steichen in a special information unit in which pilot training manuals were produced. Osborn began drawing cartoons of a pilot who was hapless, arrogant, ignorant and perpetually blundering in ways that put himself and his crew at unnecessary risk. The name of this character was "Dilbert the Pilot", and "Dilbert" was soon to become a slang term used to refer to "sailor who is a foul-up or a screwball."[8] Scott Adams credits Osborn as an indirect source of inspiration for the main character in his own Dilbert cartoons. It is not certain how many drawings Osborn produced for Navy manuals; estimates range from 2,000[citation needed] to 40,000.[9] His Dilbert was used in numerous educational posters for Navy pilots, appeared in the New York Times and Life magazine; for a while, "dilbert" became a synonym for "blunder" for Navy pilots.[10]

Thats a pretty good find..