Your modeling and texturing are great. The only thing I see that stands out is the uniform. The old steel helmet was used in WWII, The Korean War, and Vietnam I think. But, camouflage wasn’t used until the early 80’s when they switched from a steel helmet to a Kevlar helmet. To match your helmet model to the uniform I would suggest making the blouse the solid green that was worn in wars mentioned above.
Also, dog-tags are not generally worn on the outside of the uniform.
Missing the two breast pockets with name plates above them, one will read U.S. Army/Marines and the other will be the soldiers last name.
Left arm should have a unit patch an inch below the seem of the shoulder. You might want to consider putting a combat patch on the right arm as your piece depicts a man who has seen death and may be dead himself. This would mean that he has been in combat.
I don’t mean to be picky, the piece is well done. Just a few things to give it the touch of reality and it will be a very nice art piece.