By looking at him you wouldn’t know it, but Tech Sgt. Trevor Brewer, a flight chief with the 72nd Security Forces Squadron at Tinker Air Force Base, Oklahoma, has deep scars from a day seven years ago that took the lives of two fellow Airmen, and severely wounded two others. His wounds are invisible. He has post-traumatic stress disorder (PTSD) from a terrorist attack many may have heard news reports about and forgotten. But, Brewer has not forgotten that day… he relives those moments constantly.