I'd imagine it's probably something like InevitableSwing said, but also just a way to help in general with language/directions/etc. Instead of saying "Biden leaving the Oval" or "Obama en route to Chicago", both which (for example) can have numerous different meanings - is it Malia, Barack, or Michelle en route to Chicago? Beau is leaving the Oval, or is it Hunter? Same goes for just saying like "the President" - that could be misheard as Vice-President or something equally unimportant. Having a code name, even if it's public knowledge, helps with that. Doesn't really matter if they're public tbh because you'd assume that the line of communication itself is private - and even outside of that, it's less for obfuscation and more for just ensuring both parties easily know who/what the fuck is being discussed.
At least, that's my two cents and how I'd justify giving out codenames in any sort of situation I'm given leadership in.
Codenames are also chosen so they are understood over something like a radio even if the radio has static and you only get half the word. It's why the military alphabet (alpha Bravo Charlie etc) is what it is. If you only here "tel" you know it's "hotel" and therefore a H.
I'd imagine it's probably something like InevitableSwing said, but also just a way to help in general with language/directions/etc. Instead of saying "Biden leaving the Oval" or "Obama en route to Chicago", both which (for example) can have numerous different meanings - is it Malia, Barack, or Michelle en route to Chicago? Beau is leaving the Oval, or is it Hunter? Same goes for just saying like "the President" - that could be misheard as Vice-President or something equally unimportant. Having a code name, even if it's public knowledge, helps with that. Doesn't really matter if they're public tbh because you'd assume that the line of communication itself is private - and even outside of that, it's less for obfuscation and more for just ensuring both parties easily know who/what the fuck is being discussed.
At least, that's my two cents and how I'd justify giving out codenames in any sort of situation I'm given leadership in.
Codenames are also chosen so they are understood over something like a radio even if the radio has static and you only get half the word. It's why the military alphabet (alpha Bravo Charlie etc) is what it is. If you only here "tel" you know it's "hotel" and therefore a H.