National Guard troops arrive at the New Orleans Convention center in a convoy of 75 Humvees and other military vehicles to begin patrol at Mayor Ray Nagin's request in New Orleans Tuesday, June 20, 2006. The presence of Guard members patrolling the city's hurricane-devastated and largely deserted neighborhoods will free as many as 300 police officers to concentrate on crime in more heavily populated areas.
(Photo: AP Photo/Bill Haber)
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