Yeah I broadly agree. Idk when I was younger (and doing a lot more psychedelics) I had this idea that all soldiers were murders and being a conscientious objector was a moral imperative.

I've softened that view the older I've gotten but certain wars, like you point out, such as Vietnam or Iraq where the country isn't posing a threat probably retain that same moral calculus.

It is different when your country is under threat like if you were Ukranian. However I'm not sure what I'd do if I were put in that situation. To be honest I might also try to chase self-preservation over anything else.