Put down that bag of chips, maggot, and give me 50! Gen. James Conway, commandant of the Marine Corps, didn't say those exact words when he issued a shape-up-or-ship-out message to all Marines, but he might as well have. The nation's top Marine has created a rigorous fitness test to gauge combat readiness and has ordered strict enforcement of body-fat standards that he said have become lax in recent years. “Tendencies toward increased weight have become a dangerous trend over the last decade in our American society. But Marines are different,” Conway wrote in an Aug. 8 message. About 100...