Athletes attend a training session at 2016 Rio Olympics Games' Canoe Slalom Circuit, part of X-Park at Deodoro Sports Complex as Brazilian Army soldiers take part in a simulation of decontamination of multiple victims during a a training against Chemical, Biological, Radiological and Nuclear attacks ahead the Rio 2016 Olympic Games in Rio de Janeiro, Brazil, March 11, 2016. REUTERS/Ricardo Moraes