Photo of the Day: A policeman takes up position at the Jacarezinho slum during an operation to install Peacekeeping Unit (UPP) riot police in Rio de Janeiro. The introduction of the peacekeeping program in the region is part of efforts to crack down on crime and increase security as the city prepares to host the 2014 soccer World Cup and the 2016 Olympic Games. (Photo: REUTERS/Sergio Moraes)
