Cuba

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Khalid Sheikh Mohammed (right) and co-defendant Walid bin Attash attend a U.S. military hearing at the Guantanamo Bay Naval Base in Cuba on Saturday, May 5, 2012, in this sketch by courtroom artist Janet Hamlin. (AP Photo/Janet Hamlin, Pool)

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**FILE** The sun rises May 13, 2009, over the Guantanamo detention facility at the Guantanamo Bay U.S. Naval Base, Cuba. (Associated Press)

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** FILE ** Travelers line up to check with migration officials before departing from the Jose Marti International Airport in Havana, Cuba, in July 2010, while at right a TV screen displays an image of longtime Cuban leader Fidel Castro. (AP Photo/Javier Galeano, File)

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The diplomatic skills of Colombian President Juan Manuel Santos (left) were tested when the U.S. opposed Cuba's participation in this weekend's summit of Western Hemisphere leaders. (Associated Press)

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Colombia's President Juan Manuel Santos delivers a speech before his departure at the Jose Marti international airport in Havana, Cuba, Wednesday March 7, 2012. Santos said an invitation for Cuba to attend the upcoming Summit of the Americas is unlikely. (AP Photo/Franklin Reyes)

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Pope Benedict XVI arrives to lead an open-air Mass at Revolution Square in Havana on Wednesday, his last day in Cuba. The square includes an image of Communist hero Ernesto "Che" Guevara (background, left). (Associated Press)

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Pope Benedict XVI is greeted by children during his visit to the sanctuary of the Virgin of Charity of Cobre, Cuba's patron saint, in the little town of El Cobre, outside of Santiago, on Tuesday. Benedict is on the second day of his Cuban tour. (Associated Press)

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Pope Benedict XVI waves after praying before the Virgin of Charity of Cobre, Cuba’s patron saint, in Santiago de Cuba, Cuba, on March 27, 2012, the second day of the pontiff's three-day Cuban tour. (Associated Press)

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Pope Benedict XVI walks by the Virgen of the Chariry of Cobre before conducting a Mass at Revolution Square in Santiago de Cuba, Cuba, on March 26, 2012. The pope is in Cuba for a three-day visit. (Associated Press)

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Pope Benedict XVI presides over a Mass at Revolution Square in Santiago de Cuba, Cuba, on March 26, 2012. The pope is in Cuba for a three-day visit. (Associated Press)

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Pope Benedict XVI (right) celebrates a Mass at Revolution Square in Santiago de Cuba, Cuba, on March 26, 2012. The pope is in Cuba for a three-day visit. (Associated Press)

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Pope Benedict XVI waves to faithful from his popemobile as he arrives at Revolution Square to conduct a Mass in Santiago de Cuba, Cuba, on March 26, 2012. The pope is in Cuba for a three-day visit. (Associated Press)

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Pope Benedict XVI waves to faithful from his popemobile as he arrives at Revolution Square to conduct a Mass in Santiago de Cuba, Cuba, on March 26, 2012. The pope is in Cuba for a three-day visit. (Associated Press)

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Cuban-American Nestor Machado, who left Cuba 52 years ago, takes pictures outside the Virgin of Charity of Cobre Catholic church in El Cobre near Santiago de Cuba, Cuba, on March 26, 2012. More than 300 Cuban-Americans and other pilgrims have arrived in Cuba for Pope Benedict XVI's visit on a trip led by Miami Archbishop Thomas Wenski. (Associated Press)

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Pope Benedict XVI waves from the popemobile in Santiago de Cuba, Cuba, on March 26, 2012. The pope is in Cuba for a three-day visit. (Associated Press)

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A woman covers her face from the sun with an image of Pope Benedict XVI while waiting March 26, 2012, with others for the pope's arrival at the Antonio Maceo Revolution Square, where he celebrated Mass in Santiago de Cuba, Cuba. (Associated Press)

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With a billboard showing Cuba's leader Fidel Castro in the background, Pope Benedict XVI arrives aboard the popemobile in Revolution Square to celebrate a Mass in Santiago de Cuba, Cuba, on March 26, 2012. The pope is in Cuba for a three-day visit. (Associated Press)