 - A high level of posttraumatic stress will be operationally defined moderate levels a rating of 3 or more on a 1 to 5 scale of the following symptoms according to Hoge et al 4: one re-experiencing symptom, three avoidance symptoms, and two hyperarousal symptoms. Staff will complete a screening interview via telephone in which the potential participant answers questions from the Blast Exposure Screen. The Blast Exposure Screen provides a comprehensive assessment of exposure to blast for the duration of deployment. Blast events will be rated for physical effects e.g., knocked off balance, physically thrown by blast and after effects i.e., memory problems, headache on the individual. 