Two observations;
Recruiting begins in school with interest being stirred by careers teachers/advisors. Given that most teachng staff are thoroughly left wing and many anti establishment too is it any wonder the Services are simply made invisible to schoolkids at that level?
Wit regard to “ You’ll never fly with the RAF as you’re a girl” it occurs to me that if the young lady was permanently put off by that one remark it's pretty clear she didn't ahve the character to survive, let alone thrive in the military in the first place.