Marine Cpl. Travis Friedrichsen, a sandy-haired 21-year-old from Denison, Iowa, used to take Tootsie Rolls and lollipops out of care packages from home and give them to Iraqi children. Not anymore. "My whole opinion of the people here has changed. There aren't any good people," said Friedrichsen, who says his first instinct now is to scan even youngsters' hands for weapons. ...