It is coming along great. All the additional pieces look very good. A couple things I see. First is your ration boxes on the Mule. They look like MRE boxes, not C-Ration boxes. For Vietnam, they should be C-Rations. The boxes had big "C"s on them.
Also, the fuel container looks out of place. That type of 600 gallon fuel container was either mounted in the back of a truck for field fueling, or was permenently mounted at a base camp. They were not usually brought into the field and placed onto the ground.