 The project was a 5-year prospective randomized clinical trial which conducted a direct comparison of the VTC and in-person modalities using rigorous methodology and a sophisticated analysis of equivalency between clinical and process outcome domains. In addition, cost effectiveness of this modality will be addressed. Approximately 130 combat Reservists, National Guardsmen, or veterans were recruited from multiple clinical sites. Prospective participants received a comprehensive assessment at baseline to determine eligibility. The exclusion criteria selected are consistent with large PTSD randomized clinical trials as well as research using the CPT protocol with military populations with PTSD. The treatment was delivered twice a week over 6 weeks by a doctoral level psychologist. Quality control procedures were incorporated into the studys design to ensure integrity, fidelity and standard administration of the CPT intervention across both conditions. Participants received additional assessments at mid-treatment, immediately post-treatment, and at 3 and 6 months post-treatment. Outcome domains include: 1 clinical outcomes symptom severity, social functioning; 2 process outcomes perception of treatment, satisfaction, group therapy alliance, treatment compliance, and attrition and treatment credibility; and 3 cost-effectiveness outcomes. 