Noted, Osamu Ida-san! Must admit, I had thought it was the intent behind the use of the term that made the difference between use of "Jap" being derogatory rather than just lazy, but there y'go, lots I don't know. And being an ex-WB'er, I'm used to using IJ or IJN or IJA at need.
Very, very well-put post, m'dear!
!
Esme