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Brazilian Navy soldiers prepare armored vehicles during a joint public security operation to install a Pacifying Police Unit (UPP) at the Caju favela complex in Rio de Janeiro, Brazil, Sunday, March 3, 2013. Elite police units backed by armored military vehicles and helicopters invaded the neighborhood of 13 communities in Caju favela complex early Sunday in an on-going policing program aimed to drive violent and heavily armed drug gangs out of Rio's poor communities, where the traffickers have ruled for decades.