I don't like his phrasing, but what I think he was referring to was how overcoming some sort of substantial adversity together often creates a strong bond among people, even from entirely different ideologies/backgrounds/etc. When
everybody has to go through this it would create a common shared bond. Those in your family who were in the military might not be particularly able to relate to you, but are probably quite capable of relating to themselves or other vets. I am
vehemently against hegemony, and how politicians use the military in modern times, but I'd also actually support compulsory military service.
Not only do I think the bonds and training would be exceptionally beneficial for society, but it might even help us get back on the right track in terms of this hegemony nonsense. So many people seem somewhere between apathetic and thrilled about endlessly escalating military conflicts around the globe, probably because they never envision themselves being affected by it. Same reason our old enfeebled politicians act like much bigger hard asses than it's like that even warrior kings of times past did. Because it's not like they'll suffer for these wars - the only "hard decision" they have to make is to send people that they couldn't care less about, off to kill and die. War's a lot different when you're not just 'spending' other peoples' lives.