The rate of PTSD (and consequent disability) is especially high among combat-exposed military Veterans. Studies of Vietnam combat veterans have consistently found a lifetime PTSD prevalence of 25-30% of men, although rates of persistent/chronic PTSD have been somewhat lower (15-20%). Studies of OEF/OIF Army personnel have reported rates of PTSD in the 10% to 15% range following deployment (Thomas et al 2010). These rates are much higher than the rate of PTSD in the general US population, estimated to be about 6.8% (Kessler et al 2005).