Issaki, Iraq -- The crew-cut U.S. Army captain sat on the salon floor with elders of Iraq's outlaw Jassat tribe. The American fingered his own prayer beads, as the Iraqis did theirs. But the officer lost patience waiting for the tribe to turn over one of several members wanted for killing U.S. troops and local truckers. "There's no negotiation. They're going to turn him in or I'm going to destroy their whole tribe," Capt. Karl Pfuetze, 36, shouted to a translator, his voice rising in pitch and exasperation before the assembled crowd. "I'm going to put 50 people from Jassat...