I reckon there has always been 'atmosphere' between some members of the teaching profession and forces personnel.
Serving in the Royal Marines, and living in Plymouth in the 60s with my then wife, a teacher, I accompanied her to a gathering of her colleagues. They soon sussed I was a Bootneck, and the welcoming atmosphere changed instantly.
I was then approached, and asked if I had killed anyone!
I admitted I hadn't, but the evening was just starting, and I hadn't had time yet.
We left soon after that!
ERB