a whopping $800 billion. about 32,000 u.s. troops were wounded in the iraq war. an army combat engineer was one of them, suffered a severe head injury from the roadside blast. his path to recovery has been slow and difficult. a rehabilitation program in atlanta has helped him try to regain independence and connect again with his family. dr. san gr san jay gupta has the story. i had a feeling i would be injured in iraq the second time. reporter: sergeant deangelo vaun was injured in iraq in 2005. we were riding through a mission to blow up ieds. my driver, he ran over an ied and i lost one of my eyes and the left side of my skull was fractured and they had to take