One of my players is a clinical psychologist and wrote an excellent set of insanity rules (usable in any RPG system). I believe they are available for download at General Pain's Big Book of War website. I recall that that a sizable minority (maybe even a majority) of the PCs and NPCs in the PC's group in my last campaign had one or more psyche problems.
I agree that the long periods of time that soldiers would have stayed in the front line in the Twilight War would have removed any joy of combat for most of them. Having said that, there were PCs and major NPCs in my last campaign that were combat junkies. The players of those PCs portrayed them pretty well, I think. The only trouble is, if you enjoy combat too much it is likely that you'd start to lose some of your self-preservation instincts and that would reduce survival rates. Fear can be a very useful tool in helping you get home outside of a body bag.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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