. >> fresh out of high school, robert rissman signed up to fight for his country.makes an 18-year-old join the army? >> i wanted to go to college and make something of myself and the army said they'd pay for it. >> it's a contract. i'm going to serve my country, but then my country's going to serve me. >> that's kind of what i was hoping for, yeah. >> where did it fall apart? it began to fall apart in iraq. you saw things that i know you don't want to talk about. >> no, i don't. >> and probably never want to talk about. >> no. >> you see, robert was in a rapid response unit. he saw action night after night. >> i got back from iraq, and i was having a lot of psychological issues. i guess you could say. >> post-traumatic stress? >> post-traumatic stress disorder. >> back home at fort carson in colorado, he started feeling like people were out to get him. a few months later, someone discovered robert's illegal sawed-off shotgun hidden in his barracks. according to army papers, robert told investigators he was suicidal. at one point, he spent a full day drinking, then