I wonder if anyone would've picked it up? You would have to listen to the song over and over. Then figure out morse code and what letter each signal represented.
If you know Morse code already it's probably something you can work out in real time in your head.
If you know Morse code already, you just hear it.
Soldiers learn Morse code as part of their training. It's still in widespread use, and required for any sort of advanced sailing license.
Former Colombian soldier over here, at that time, only radio operators were trained in Morse code; regular soldiers would have a hard time to get the message.
What proportion of soldiers would have learned it?
About one per squad (1/13)
Thanks for the interesting correction! I imagined it would be common for all soldiers as Morse can also be used to signal with a flashlight etc..