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I enjoy the shots. Especially the first one. Good pose. However, I think you could have a bit of fun in PP by grunging him and his uniform up a bit. Nothing extreme is needed, but it seems a bit too clean to me. Unless of course you are just after the 'new recruit' look.
Lots of things you could do that I know of (in Photoshop if you use it), like duplicating the layer, burning some midtones, adding some texture and doing a highpass layer to bring it out. You could also use a very large size dry media brush and sample a dark color from his uniform, and then make a few clicks on his uniform, the sandbags and even his face. It will give it a slight blotchy look.
You can finish by lowering the opacity of the layer with the effects until it's something you like and even change the blending mode. I did a fast version and soft light worked best. Just a few ideas.