Inclusion Criteria:  18 years of age or older Prior or current service in the U.S. military Diagnosis of PTSD within the last month Ability to speak and understand the English language Stable psychotropic medication dosing for at least 3 months Ability to complete the informed consent process  Exclusion Criteria:  Prior SGB treatment or CPT treatment History of schizophrenia, another psychotic disorder, or bipolar disorder Moderate or severe traumatic brain injury Moderate or severe symptoms of a substance use disorder within the preceding 30 days Severe suicide risk warranting suicide-focused treatment and/or inpatient hospitalization Impaired mental status that precludes the ability to provide informed consent Any ongoing stressor or condition deemed by the investigators to place the participant at risk for injury or a poor outcome