I agree with Union Jack about the WRNS not being civilians. The way I heard it was that at one time - maybe always? - a WRNS officer had to spend some time as a rating, rather like all coppers have to do time on the beat first.
Ergo, however unlikely in practice, all could theoretically be considered "potential officers".
Heard that separately from a couple of (light blue) mates who both married Jennies - any confirmation from the Dark Blue??
As to "segregated" housing, I think SFFP above misses the point. It's doesn't matter who your neighbours are - if they are in a different organisation. Which kind of kills the "class" argument.
When the then newly acquired Milady Teeters and self first moved into quarters, she too raised a beautifully formed eyebrow. The I said (she was a nurse):
"How would you fancy living next door to matron?"
And suddenly she understood ..........