I think he overdid a bit on the helmet. Even slight head movement would be very conspicuous because so much would swirl around.
The narrator also confused concealment (protection against detection, not against shot) with cover (protection against both) at times.
Isn't it a bit uneasy how much the narrator stresses the importance of being speedy on the foot at times? The movements shown when he says so are largely impossible for a modern infantryman weighted down by 15+ kg of armour alone.