Composition is great, nice and compact and a clear story; painting looks pretty good, (I really like the leather on the shoes!); very good use of rubble and ruins.
As Vinnie suggested above, the helmet straps should be a different color, more like a khaki. There appears to be something happening at the sleeves, especially the guy with the Garand. I',m not sure if his shirt sleev is below the jacket ang got painted flesh or what. Take a look at that.
For the future, you'll have a better presentation if you stain the wood rather than leaving it natural.
.