Brazilian marines inside a combat car observe as police officers from the Special Operations Battalion (BOPE) stand before an operation to install the Police Peacekeeping Unit (UPP) at Parque Alegria slum and its region, in Rio de Janeiro March 3, 2013. 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 World Cup soccer tournament and the 2016 Olympic Games. REUTERS/Ricardo Moraes (BRAZIL - Tags: CRIME LAW CIVIL UNREST SPORT SOCCER WORLD CUP MILITARY)