Austrian-Hungarian soldier, 1918. "It looks like a thousand yard stare, it’s like there’s nothing there. The rank insignia indicates that he is Austrian-Hungarian soldier, not German, he’s a lance corporal. In case you’re wondering, those lugs on the side of his Stahlhelm helmet were combination air vents and mounting lugs for an extra armor plate for nervous soldiers." More information about the Stahlhelm helmet at link.