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Could be that it takes a specific intrinstic sense of purpose to be directly involved in this type of combat and not get pushed over the edge are the ones selected fo rmultiple deployment?

I'm not sure that it is necessarily surprising that individuals that have self-selected to enter directly into this conflict (be it for reasons of serving others, hatred, or simply the need for income/educations), are trained, and then must cope with the cognitive dissidence between the civilian world as it is and the world they've experienced/been trained for without having the distraction of constantly defending one's life tend towards mind altering substances and suicide at a higher rate than the average population or someone that is actively using that training directly in the conflict.