A SGT. ROCK ADVENTURE FOR THE AGES! Sgt. Rock of Easy Company lays it all on the line to show his men he\'s got what it takes to pass a most dangerous initiation, and in a special two-part adventure, thrill to the first appearance of Rittmeister Hans von Hammer--Enemy Ace--as the Human Killing Machine does brutal battle in the skies over World War I Europe! (W) Robert Kanigher (A/CA) Joe Kubert