Now, in order to prevent the enemy from issuing fake or confusing orders, CRM 114 is designed not to receive at all unless the message is preceded by the correct three-letter code group prefix.
16 seconds sound clip from the Dr. Strangelove movie soundboard.
You can hear this line at 00:27:44 in the Blu-ray version of the movie.
Quote context
[...]
- They will continue until they reach their targets.
- Then why haven't you radioed the planes countermanding the go code?
- Well, I'm afraid we're unable to communicate with any of the aircraft.
- Why?
- Then do you mean to tell me, General, that you will be unable to recall the aircraft?
- That's about the size of it, sir.
- However, we are plowing through every possible three-letter combination of the code.
- How soon did you say the planes would penetrate Russian radar cover?
[...]