the world. and shadows one of the most dangerous jobs but the u.s. soldier in afghanistan bares scars brought from home. he was a victim of the deadly shooting spree at ft. hood in texas. cnn's ivan watson has his story. >> reporter: some of the soldiers fighting this war are survivors of one of the deadliest domestic shooting incidents in american military history. a bomb-hunting patrol rolls home in a cloud of dust. among the road weary troops, alan carroll from new jersey. he moves with surprising strength and speed, less than a year ago carroll was shot four times with a pistol. >> i got hit one right there. i took one right there. came out here. i took the one in my side and one in my leg. >> reporter: carroll was wounded not in afghanistan but at ft. hood, texas, during a shooting