Hey for your first attempt not to bad. Just a few pointers that I have noticed. I think your depicting it in a training setting minus the slat armor and that is good. The uniforms look like the old woodland camo and not that new army digital camo they wear. The weapons on one figure look like the M16A1 series. I think the M1130 Strykers have a exhaust deflector mounted as well, since I am at work I don't have a reference book handy. I think the helmuts are the the older "Fritz" style as well.
The weathering is great. I always like mine to look well used so I am big into weathering, wet and dry washes really set out the vehicle. I built a Leopard 2A6 for the BIg Cat campaign and compared a couple of photos on weathering vs non weathering. It really sets it apart when you do that. I also use colored chalk as well for making it look dusty.
Hope my words aren't to harsh, really, for your first build it is a great looking model and I hope to see more of your posts.