Operation Pacific (1951)

Lt. Larry: [finding themselves in the middle of the entire Imperial Japanese fleet] I'll never make fun of another movie as long as I live.

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Duke E. Gifford: How's the picture?
Lt. Larry: Oh, all right I guess, sir... the things those Hollywood guys can do with a submarine.

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[crewmembers struggle to fix leaking hatch]
Sister Anna: Anything I can do to help?
Jonesy: Spit teeth and cuss!
[sees sister Anna]
Jonesy: Sorry sister, didn't see you.
Sister Anna: That's alright, go ahead, I'll spit teeth!

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During filming Gary Cooper visited the set to persuade his mistress Patricia Neal to abort his child. Neal later became a pro-life activist.
John Wayne and Patricia Neal did not get along during filming. She was particularly annoyed by his treatment of a gay publicity man. Nearly fourteen years later, however, they worked together on In Harm's Way where she noted that he had mellowed a lot, possibly because he was seriously ill with lung cancer at the time.
The problems with submarine torpedoes shown in the movie are accurate. A poorly designed and tested firing pin could malfunction on a good hit (that is, a torpedo striking within about 45 degrees of perpendicular to the side of the target). Poor hits (at a very sharp angle to the side of the ship) could often produce more reliable explosions. Finding the problem, while not performed by the submarine crews as shown, actually did occur in a similar manner.
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