As long as the US does not rely on robots for military operations they will have to use the working class like robots--or worse. The only thing is that soldiers feel fatigue, they see and feel the inhumanity and the futility of war. And the military response is to give them meds and tell them to "suck it up" as they face another tour.
According to a Time Magazine report (6-5-08, "America's Medicated Army") "about 12% of combat troops in Iraq and 17% of those in Afghanistan are taking prescription antidepressants or sleeping pills to help them cope." The report does not indicate the number of soldiers who self medicate with alcohol and illegal drugs.
According to the Time report stress illness begins "with mild anxiety and irritability, difficulty sleeping, and growing feelings of apathy and pessimism. As the condition worsens, the feelings last longer and can come to include panic, rage, uncontrolled shaking and temporary paralysis." The Pentagon states that only 10% of soldiers experience long-term "stress illness", but who can trust the military to be honest and objective?
What will be the long-term effects on these people, and on American society? According to the Time report "the symptoms often continue back home, playing a key role in broken marriages, suicides and psychiatric breakdowns."