Hyperbaric Oxygen Therapy in Chronic Traumatic Brain Injury or Post-Traumatic Stress Disorder

This is an observational research study whose purposes are to see: 1. if 40 Hyperbaric Oxygen Therapy sessions at 1.5 atmospheres (HBOT 1.5) or more (60, or 80 HBOT's) help, worsen, or have no effect on subjects with chronic TBI/PCS (Traumatic Brain Injury/Post-Concussion Syndrome) and/or PTSD (Post-Traumatic Stress Disorder). 2. if improvements or worsening of symptoms can be recorded with computerized and written tests for memory and thinking, and with questionnaires about the subject's quality of life and health. 3. determine the long-term outcome of the treatment. 4. confirm, in large numbers of study participants at multiple sites nationwide, the strong positive results obtained in pilot studies