Yes, I’ve read it. He also has some good TED talks.
The curious thing is that the military is as tribal as it gets and the Marine Corps is even cult-like. I used it as an example of smaller tribes finding unity in the things they have in common, rather than focusing of the differences.
I’m an advocate of the idea that all men are brothers. I don’t imply sexism in that as I use man as humanity and brotherhood as kinship. That is not the changing meanings of words that I often object to, it is a more original understanding. Those who cling to identity politics will likely object to the terminology but I’m too old for cumbersome qualifiers to virtue signal my inclusiveness.