Americans seem to have two types of people in their armed forces. Some are like OOE (ok he's canadian) who you can tell is educated or like these guys, generally nice guys. Others are total A-class jerks who just joined the armed forces because they were too stupid to get a job elsewhere.
From what we see on TV regularly, the army's recruiters actively seek people from these slums of America. These are the people who have made those other kind of videos that you can so easily find on Youtube.