I think you're right about this. The reason why I mentioned NATO is that I learnt the phonetic alphabet in the army. Sorry for any convenience caused.
According to Wikipedia, it's called NATO phonetic alphabet although it's also used by international civil aviation and many others. I'm not allowed to post links yet, but the keyword in English Wikipedia is
NATO phonetic alphabet - and in Swedish Wiki it's
Bokstavering (very good table appears).
I learned it from my sister who's an air traffic controller in Sweden, and found it extremely useful when in England for any spelling purposes. I'm not sure to what extent it's known among the general public in the UK - I heard impressed comments from Police or Forces members whenever I used it, suggesting they didn't expect that from a civilian...
What I have yet to find out is how Swedish ATC deal with Å, Ä, Ö and also what alphabet Swedish forces are using. Both questions have been emailed to my sister, so hopefully I'll have an answer to post within the next few days...
I simply love Wikipedia...
/Wilma