Mild psychological diseases - soldier specific?

[TteFAboB]

Greetings,

Could a soldier suffer from some mild disorder, something that would probably go unnoticed, undiagnosed, just for being in the Army? Neurosis, compulsion, obsession, anxiety or some sort of anti-social behavior that is not so severe to be easily detected at anytime but that might present itself in specific situations.

Is there such a thing? Can a soldier be affected by war just enough to become a little looney but not enough as to be diagnosed with severe disorders?

Perhaps this type of lesser neurosis wouldn't exactly be exclusive to soldiers, but to anybody who has a psychologically demanding job, for example: Air Traffic Controllers. Would Stress have this effect? Would spending a decade in the Navy on a stressful post be enough to cause a disorder on an individual prone to it, even in times of peace?