The M113 is a kit from the mid-1970s, but is has a nicely detailed interior, and good overall fit. I added some items to the interior, as well as a decent amount of weathering and a shield for the .50 cal machine gun. The figures are chunky and lacking details such as the helmet covers, but they were used anyway. As for the base, I had limited resources to do the groundwork, as well as limited skills in modelling Vietnamese terrain, but the reddish soil or clay is prevalent in many pictures from the Vietnam War.
Here's some pictures of the sprues: