Not sure about why people are surprised by this alphabet. It’s been in use for quite some time in its current form. I work in aviation and we always use this for radio communications. Obviously the military does too.
I personally hate it when I say the nato alphabet equivallent and somebody just gets confused. Like "what do you mean alpha, is that what I need to type?". Or worse yet, they start using names and end up with the joke from Archer - "M as in Mancy" or other nondescript names for letters.
For the layperson you have to do the "[letter] as in [phonetic alphabet equivalent]" format. Most people will understandably get confused if they ask how to spell your name and you tell them "Alpha-November-Delta-Yankee". If they're not used to it or never heard it it'll sound like you just started having a stroke.
I guess i watched a bunch of war movies as a kid; because as an adult mid 20s somebody on the phone spelled out their software code using phonetic alphabet, it took me a split second to process the unexpected, but then knew it was the first letter from osmosis i guess
My problem is that I absolutely blank when coming up with words to use, even if it's my own damn name. At least this gives me a standard set to work with.
Tbf most people never have reason to use it so they don’t know it. Or they just think the words are random after watching a cop drama or comedy where a word is spelled out over a radio. Also there seems to be an independent police phonetic called then “LAPD” alphabet, but I can’t tell if it’s intended to be serious or just mostly lifted from movies and tv.