From the mid-1950s through the mid-1980s, the DJ delivered most of America's mail.
* "DJ" stands for Dispatcher Jeep. The Jeep now called the Wrangler was sold for decades as the CJ, or Civilian Jeep.
* The vehicle is very different from CJs of the same era. It has a lighter frame, rear-wheel-only drive and a DJ-only 5-slot grill. A lot of them had transmissions from Chrysler, and they had engines from several sources.
* I have no idea what that extra radiator/cooler attached to the grill does.