Army kids are mainly nerds and geeks that have an obsession with anything that has to do with the military. They usually talk about weapons and go paintballing/airsofting and take it seriously. These kids look up to authority figures and aspire to become one. Their intelligence varies from below average to very high and are generally out-casted. They often have an arrogant attitude and although are usually not a main member of school cliques, tend to drift around and have several friends (mainly other nerds, thespians, punks, etc.)
Kid 1: Why is that kid wearing a military uniform at school?
Kid 2: He must be an army kid.