Police officers take position at the Caju slum complex during a conjoint operation to install a Pacifying Police Unit (UPP) in Rio de Janeiro, Brazil, Sunday, March 3, 2013. Elite police units backed by armored military vehicles and helicopters invaded the 13 communities part of the Caju slum complex early Sunday. The action is part of a policing program aiming to drive violent and heavily armed drug gangs out of Rio's slums, where the traffickers have ruled for decades. (AP Photo/Felipe Dana), APTOPIX