In this Sept. 19, 2014 photo, counternarcotics officers walk in a clandestine airstrip strewn with boulders, in the Apurimac, Ene and Mantaro River Valleys, or VRAEM, the world's No. 1 coca-growing region, in Junin Peru, Friday, Sept. 19, 2014. The boulders are used as a way to camouflage the airstrips from air observation. Security forces say that traffickers pay local villagers to keep the runways hidden and to repair them when they are cratered in counternarcotics operations. Rodrigo Abd / AP
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