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Former US President George W. Bush(C) greets US military veterans at a press preview of his new painting exhibit, "Portraits of Courage", at the George W. Bush Presidential Library and Museum in Dallas, Texas, on February 28, 2017. Former US president George W. Bush released a book featuring a series of 66 portraits of wounded or traumatized veterans he had met who served in the US military in Iraq or Afghanistan following the attacks on September 11, 2001. / AFP / Laura BUCKMAN / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)

Former US President George W. Bush(C) greets US military veterans at a press preview of his new painting exhibit, "Portraits of Courage", at the George W. Bush Presidential Library and Museum in Dallas, Texas, on February 28, 2017. 
Former US president George W. Bush released a book featuring a series of 66 portraits of wounded or traumatized veterans he had met who served in the US military in Iraq or Afghanistan following the attacks on September 11, 2001. / AFP / Laura BUCKMAN / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION        (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)