The Mobile Home, in its original form, is a motorized camper. The casting was adapted at least twice, first by adding a radar/communications dish to the rear roof (NASA Tracking Vehicle), and later by adding emergency lights, sirens, and either a radar/communications dish or a cannon to the forward roof (Command Vehicle). The cannon was variously styled as a foam cannon (for fire suppression), a water cannon (for fire suppression or crowd dispersal), or a gun (for military use).