A bit more from the article above...
'Decided to take off'

April Roper, a slender 26-year-old woman with almond-shaped glasses and long, dark hair, said her husband seemed excited to be home when he returned in the summer. They live on Dixie Road, a leafy neighborhood of Fort Campbell military housing.

When he saw their children, now 6 and 3, he started to cry. Within 10 days, he got worse. His wife saw a "look in his eyes" she had never seen and still cannot describe. He would bolt upright in bed and stay awake for hours. Once, she woke to see him staring at her strangely. "I grabbed him around the neck and said, 'Please, let's go to bed.' "

He never went into detail about what happened to him in the war, and she never asked. But he told her "he could see things still, the horrific things he had seen. He said he'd hear screaming."

She felt helpless: "How can you help somebody you can't relate to or understand what is happening?"

At least, she felt, his soldier days were about to end. The Army was "chaptering" him out, meaning he would once again be just Citizen Roper. Then he disappeared, failing to report to duty Oct. 7. Since then, the Army has considered him absent without leave.

"He was in the process of clearing when he decided to take off," said Sgt. 1st Class Mark Hess.

April Roper last spoke to her husband from the Canadian border the night before he disappeared. She'd driven 20 hours north to see her sick grandmother, taking the children. She and her husband had been arguing about something, she said, so they didn't talk long. Over the next few days she learned from a sergeant that her husband had left the base.