I dunno actually - given the size of the armed forces these days you end up only having people serving who REALLY want to be there. Most of us will do what is needed to defend the country, it’s just a VERY different landscape to what it was back then. War is a very different beast, with so much of my career spent working against the concept of terrorism and its ideologies, rather than going after specific countries and it being obvious when you’ve won.
I’m an aircraft technician so I’m not out there shooting people and I wouldn’t be storming the beaches, but if it came down to people at my level having to physically defend our shores from hostile invasion you’re god damn right anyone serving would take up the task, from HR to engineer to commando.
The world and the military have changed, but the principle behind serving has not.