In my experience, normal people are quite confused by this. I've heard "Is that Juliette with a J?" and facepalmed.

In my experience people understand perfectly well but assume that you are ex-military.

> In my experience people understand perfectly well but assume that you are ex-military.

When I use phonetic alphabet on the phone, I preface it by saying, "Let me spell it in 'airline pilot': ...." (But yes, I learned it in the Navy.)