Members of the Brazilian military forces take part in a drill against terrorist and chemical attack prior to the Rio 2016 Olympic Games, near the Arena Corinthians stadium, in Sao Paulo, Brazil, on July 28, 2016. South America's largest country will deploy 88,000 soldiers and police during the Olympics, more than double the number at the London 2012 Games. [Photo: Xinhua/Lui Siuwai]