I suppose it would be mostly practical skills, cooking, fixing things. Usually had to be done by people themselves.
Maybe also mental things like navigating (with or without paper map) and remembering their daily and weekly agendas.
What other things would be a big difference with the people today?
1975 is a weird place for that, actually. During and right after WWII motivations for fighting it were mixed. Obviously most white Southerners shipping off to Europe weren’t anti-racist. Obviously Einstein was. The sanitised, mythologised version that people think back to today really got going in the 80’s.
I remember last rememberance day in Canada, our public broadcaster did a live interview with a veteran. He was an actor involved in recruiting, and just casually mentioned it was a blackface act.