Beware the smiley face! =D
...or any other mental trauma? I haven't read the books so do they show signs of it in any of the Spartans?
I know they are trained and such and practically brainwashed from a young age but at a certain point surely the war will take some sort of toll on them? They do have feelings, after all.
Obviously ODST's/Marines and any other personnel will do so.
Oh and PTSD is Post Traumatic Stress Disorder, for those who don't know - a common mental illness amongst war veterans.