The proposed research will evaluate the safety and practicality, feasibility, and efficacy of a relatively simple, manual guided integrated cognitive behavioral therapy (ICBT). ICBT (a revised edition of what was formerly called cognitive behavioral therapy for posttraumatic stress disorder [CBT for PTSD]) has been designed and developed for delivery by counselors employed in community addiction treatment programs and offered in conjunction with standard community addiction treatment. The investigators have completed a Stage I Safety & Practicality Study, Feasibility Study and Pilot Randomized Controlled Study (comparing ICBT versus a control condition) in community addiction treatment and for all studies found that ICBT was safe and effective in reducing PTSD symptoms, improving retention, and in reducing substance use. The present study proposes to conduct a Stage I study of ICBT among Operation Enduring Freedom (OEF) Operation Iraqi Freedom (OIF) and Operation New Dawn (OND) Veterans within the Veterans Affairs treatment setting. The investigators will modify the existing ICBT for testing in a VA setting, and use a combined individual and group modality.