 This study will determine whether telephone support improves clinical outcomes of veterans who begin outpatient treatment for posttraumatic stress disorder. Participants will be randomly assigned to receive either usual care or usual care supplemented by biweekly monitoring and support by telephone during the first 3 months of treatment. Patients in both conditions will be compared on PTSD symptoms, engagement in treatment, violence and drinking at 4 months and 12 months after entering treatment. 