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Robert Peraza, who lost his son Robert David Peraza, pauses at his son’s name at the North Pool of the 9/11 Memorial during tenth anniversary ceremonies at the site of the World Trade Center in New York, September 11, 2011 (Credit: Reuters/Justin Lane/Pool)

Robert Peraza, who lost his son Robert David Peraza, pauses at his son's name at the North Pool of the 9/11 Memorial during tenth anniversary ceremonies at the site of the World Trade Center in New York, September 11, 2011 (Credit: Reuters/Justin Lane/Pool)