Of the primary emotions fear is the one that bears most directly on survival. Children show fear. Adults try not to maybe because it's shameful or in some circumstances dangerous. The fear response is automatic though and your body runs through its reflexes whether you want it to or not.
I think as a rifle platoon and company commander your view is about 1 000 meters in front of you and you hope you can cover that ground and not have to back up and give it up again.
