Strategypage article describing US psychological casualties in the war on terror. An estimated 30% of the troops that have served in theater have been treated for injuries ranging from diseases to combat wounds including 25,000 cases of PTSD,1775 ASTD cases,17500 cases of depression and 9100 with psychoses.
http://www.strategypage.com/htmw/htatrit/articles/20060709.aspx