The Research Plan proposes a pilot feasibility trial for an RCT of Cognitive-Behavioral Therapy for Anger and Aggression in Combat Veterans with PTSD (CBT-A). CBT-A is a 12-week manualized group treatment protocol that has been designed to address the specific needs of combat Veterans whose PTSD-related anger and aggression interfere with effective community reintegration. The group was implemented with 4 male Vietnam Veterans with severe combat-related PTSD who were referred for anger management treatment, and preliminary data were promising. The active comparison treatment for the pilot RCT will be group Present-Centered Therapy (PCT), a manualized treatment for PTSD that controls for treatment time, social support, and instillation of hope. The proposed research project will address the following Specific Aims: Aim 1: Characterize the differential effects of group CBT-A and group PCT on anger, aggression, and anger/aggression-related limitations to psychosocial functioning and community reintegration in combat Veterans with PTSD; and Aim 2: Evaluate study feasibility and treatment delivery procedures of an RCT comparing CBT-A to a PCT comparison condition. The results generated will guide the design of a full RCT to be funded by the end of the CDA-2 funding period. The research, training, and mentoring plans outlined here will provide the foundation for the PI's independent research career developing a systematic program of research in the treatment of anger and aggression among combat Veterans with PTSD. The availability of empirically-supported anger treatment would benefit the many Veterans with PTSD who return from combat reporting problems with anger and aggression.