doctors huddled over a 24-year-old marine named jesus vedana. he had shrapnel in his brain and i was the only neurosurgeon in the area. i was asked to help. i didn't hesitate. jesus made it. i paid a visit to see what happened when the chaos was over. with his jaw set is, his eyes gleaming, jesus swells with pride. he's a marine ready for battle. he has no clue a single bullet will soon dramatically change his life. >> you miss it. >> i do miss it. you were shot in the head. so you miss being a marine. >> it was probably one of the best experiences of my life. i don't regret being in it. >> so you still keep the helmet? >> yeah. right here. that's the entry wound. >> you can see how big it was when it got through the helmet. >> it's been almost ten years. next month. >> yeah. april 8. >> on that day in 2003 bombs and bullets rained down across baghdad. vedana's unit was on patrol when snipers fired. one minute he was yelling orders into a radio. the next -- he fell silent. a single bullet had pierced his helmet. just south of baghdad i was embedd