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However, Marxist theory is not about workers being the most pure hearted and good people

Agreed up until this point. It has nothing to do with "morality/vibe checks". It has everything to do with recognizing the threats and security issues that someone who has had service in the military. I also have to disagree with the comparison between soldiers in the periphery vs the Core.

Those in the periphery advance in class when they join the enforcer class; becoming closer with the colonial institutions that exploit their nation. In the core, 80 percent of those who join the military come from higher income brackets. They are actively giving up privilege, power and wealth to become a member of a core's murderous enforcer class with global prestige. That does have relation to Marxist theory, in that I am objectively observing their class characteristics and how those are imposed over their material conditions and how to organize/recruit them. I mentioned why those reasons are important.