Veterans who are currently receiving psychotherapies - individually or in a group setting - that are considered to have significant benefit for PTSD, according to the VA and Department of Defense (DoD's) Treatment Guidelines, will also be excluded. These therapies are cognitive therapy for PTSD (e.g. cognitive processing therapy (CPT)), exposure therapy (e.g., prolonged exposure therapy), stress inoculation training, and eye movement desensitization and reprocessing (EMDR). Other forms of therapy and case management which do not specifically target PTSD symptoms and/or have not been shown to provide significant benefit in PTSD will be allowed at entry and throughout the study (e.g. supportive therapy, psychodynamic therapy, anger management, cognitive behavioral therapy for symptoms or problems other than PTSD).