In the nearly two years Cpl. John Callahan of the Army was away from home, his wife, he said, had two extramarital affairs. She failed to pay his credit card bills. And their two children were sent to live with her parents as their home life deteriorated.
Then, in November, his machine gun malfunctioned during a firefight, wounding him in the groin and ravaging his left leg. When his wife reached him by phone after an operation in Germany, Corporal Callahan could barely hear her. Her boyfriend was shouting too loudly in the background.