The arrival of winter never fails to remind me of the examples throughout military history in which humans have ventured out into the freezing cold and biting wind to engage in mortal combat with their foes. Whether we’re talking about broad geographic areas like the entire Eastern Front during WWII or smaller patches of blood-stained ground like the Chosin Reservoir in Korea or the Aleutian Islands in Alaska, fighting in the extreme cold adds a whole new level to the brutality of warfare.