MOSUL Iraq — Until the past week, Samar Hassan had never glimpsed the photograph of her that millions had seen, never knew it had become one of the most famous images of the Iraq war. “My brother was sick, and we were taking him to the hospital and on the way back, this happened,” Samar said. “We just heard bullets. “My mother and father were killed, just like that.” The image of Samar, then 5 years old, screaming and splattered in blood after American soldiers opened fire on her family’s car in the northern town of Tal Afar in January...