Cpl. Bobby Joseph listens patiently as his buddy Cpl. Justin Kinnee, 26, of Pasadena, Ga., talks very slowly about a problem he is having that day at the Wounded Warrior barracks at Camp LeJeune. Kinnee was hit by an I.E.D. in Fallujah, causing a traumatic brain injury, paralyzing his left side. The scar on his head is from where doctors cut his skull to relieve pressure on his brain.