I got bored and did a little math here.
Assuming:
US soldiers have been inside Iraq so far, after rotations: 200,000
Average expected tour for a soldier over the course of the war: 2 years
Assuming in cases where the numbers given were for both Iraq and Afghanistan combined, that 75% were from Iraq (where most of the troops are)
Then, a given soldier has a...:
~4.8% chance of being medically evacuated for direct combat injuries (excludes things like swerving to avoid insurgets and getting in a car accident, situational health hazards, etc)
~8.3% chance of being medically evacuated (all cases)
~2.6% chance of being evacuated due to a mental problem severe enough to warrant evacuation (soldiers are screened for mental health conditions before being sent to combat)
~0.4% chance of coming back psychotic
16% chance of ending up with either major depression, generalized anxiety, or post-traumatic stress disorder
~0.7% chance of coming back dead.
* - I couldn't find the percent of the wounded who had lost limbs, so no statistic on this was included. Also, since stateside suicides aren't reported by the military, I didn't bother with a suicide category (the number that commit suicide in Iraq, which is notably higher than the military's average, is irrelevant without knowing how many killed themselves shortly after they got back home).
References:
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