You need to do a little more research. Try this:
He had been in that heightened state of awareness some soldiers enter into when engaged in close combat. Some say that when they’re in this state, all their senses are focused on killing the enemy. Their senses are magnified to the point their vision can detect and identify the smallest detail; they can hear a leaf fall out of a tree at a hundred meters and identify the type tree it fell from; they can smell the enemy’s breath and identify what they ate for their last meal, and their physical strength is magnified three fold. Soldiers have been shot through the heart while in this heightened state and have continued to fire, empty a magazine, change magazines, empty it again and throw a grenade before their body falls down and dies. Some call this heightened state an “adrenalin high,” and some simply call the state “Berserk.” What it really is I don’t know, but I do know it exists.
http://www.projectdelta.net/wrong_valley.htm
You are expressing a claim that all soldiers, are always the same, and equally engaged in every fire fight, because it is a firefight, I disagree, you also used in your description, elite soldiers.