Members of Brazil's Battalion of Special Operations (BOPE) participate during a crisis simulation exercise conducted by the BOPE to show the media how security will be provided during the 2016 Olympics at the Golf Olympic bus station in Rio de Janeiro, February 11, 2015. [Photo/Agencies]

Members of Brazil's Battalion of Special Operations (BOPE) take positions during a crisis simulation exercise conducted by the BOPE to show the media how security will be provided during the 2016 Olympics at the Golf Olympic bus station in Rio de Janeiro, February 11, 2015. [Photo/Agencies]

A man role-playing as a kidnapper holds onto a woman role-playing as a kidnap victim during a crisis simulation exercise conducted by Brazil's Battalion of Special Operations (BOPE) to show the media how security will be provided during the 2016 Olympics at the Golf Olympic bus station in Rio de Janeiro, February 11, 2015. [Photo/Agencies]

A member of Brazil's Battalion of Special Operations (BOPE) exits a police helicopter during a crisis simulation exercise conducted by the BOPE to show the media how security will be provided during the 2016 Olympics at the Golf Olympic bus station in Rio de Janeiro, February 11, 2015. [Photo/Agencies]

A member of Brazil's Battalion of Special Operations (BOPE) walks with a police dog during a crisis simulation exercise conducted by the BOPE to show the media how security will be provided during the 2016 Olympics at the Golf Olympic bus station in Rio de Janeiro, February 11, 2015. [Photo/Agencies]

A man role-playing as a kidnapper reacts during a crisis simulation exercise conducted by Brazil's Battalion of Special Operations (BOPE) to show the media how security will be provided during the 2016 Olympics at the Golf Olympic bus station in Rio de Janeiro, February 11, 2015. [Photo/Agencies]