The LJ uses the same sheet metal as this truck, but it is an NR military vehicle. One of many models that Mack built for the military in WWII. They built at least 9 varient NRs and this may be an NR9 as it has the all steel cab.There were....NM,NO,EH Flat bed,&tractor. I think there may have been smaller numbers of civie models for specific non combat roles