This is quite good; I can actually feel the heat and toughness of the battle hot-zone. I like the weapon and armor designs too, they feel modern, yet bit of futuristic features can be noted too, as your intention was.
little criticism: I notice that one of the soldiers (standing in the centre) is holding a machine gun, which seems to be a bit mis-designed. Usually the rounds are fed into the guns from left side, not the right. The used-up bullet casings are ejected by right side, so that the thrown-out casings won't be hitting your face. (It'd be other way around for the firearms for left-handed people)
I graduated high school with art profile but after that I couldnt afford to continue in this direction to University. So now its "work work work rice rice rice" . Anyways most of my skills are self-taught.