I can't speak with certainty, but I can speak subjectively on this -

I have family and friends all over the US (I'm only missing someone from both Dakotas to complete the collection), so I've heard damn near every accent, regional dialect, language, etc that there is to hear in the US, including some near dead native languages and Pennsylvania Dutch.

The only people I know that use "females" instead of women are either in the military like OP or they're sexist. Sometimes it's blatantly misogynistic, sometimes they're casually sexist.

Or they're both. It's frequently both.