Numb, Collard willed himself to pull the trigger. He still was deliberating when his daughter found him and called 911. "The doctors didn't really know what was going on," he said. "They didn't understand. Neither did I." The incident came 23 years after Collard joined the Army at age 20 and went to Vietnam as a combat medic. He spent 13 months covered in blood.

By 1991, he already had spent more than two decades trying to forget it, and he'd had enough. Collard slept one hour per night for 23 years. When he did sleep, he was haunted by a recurring nightmare. In the dream, Collard is back at the medic table, up to his elbows in blood.

"I was exposed to injury, death, blood, lots of body parts," he said. "I wake up at night and I am covered in blood, and my clothes are covered in blood. It is so real, I can see it."