Fred grew up in a close, mutually-supportive, middle-class family and was known to be outgoing and friendly with an optimistic outlook on life. After completing an undergraduate degree in engineering, he received a commission as an officer in the Army. His early career was marked by advancement, close relationships with peers, and the respect of both enlisted personnel and the officers above him. He was deployed to a nonconventional combat area in which improvised explosive devices were common and, as a result of exposure to blasts, he experienced several brain injuries. Once such blast took place directly in front of the vehicle in which he was riding and he was critically injured and others in the vehicle were critically injured or killed. Consider Fred's history. What factors would tend to increase his risk of being diagnosed with PTSD