Or so he thought. Within a year of his return home, Hussey was told he had post-traumatic stress disorder (PTSD), a psychological condition that can develop in the emotional aftermath of a life-threatening event. He was also diagnosed with a mild traumatic brain injury, the medical term for concussion. Only there's nothing mild about it. His experience left him with constant headaches, nausea, garbled hearing, insomnia and alarming memory lapses. Concussion symptoms are supposed to clear up in a few weeks or months, but two years later, Hussey, 39, still has them. "At first I thought I was doing OK," says Hussey, who is now posted at Fort Jackson, in his hometown of Columbia, South Carolina. "But as time went by, it got to where I couldn't remember the names of guys I was deployed with. I was having difficulty concentrating. It started snowballing, and I was forgetting things and struggling to cope. It's hard to explain, but it's just affected everything I do."