Operations | Slideshow

Brazil Terror Drill

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Brazil Rio Olympics Security

A fire department helicopter flies over as part of an exercise drill simulating security forces reaction to a chemical attack outside the National Stadium, which will host 2016 Summer Olympics soccer matches in Brasilia, Brazil, Thursday, July 28, 2016. Double the number of military and police are expected to patrol during the games, compared to London in 2012, and while most will be concentrated at sporting venues, tourist landmarks will also be heavily patrolled. (AP Photo/Eraldo Peres)

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Brazil Rio Olympics Security Drill

Soldiers and firefighters carry a person on a stretcher during an exercise drill simulating their reaction to a chemical attack outside the National Stadium, which will host 2016 Summer Olympics soccer matches in Brasilia, Brazil, Thursday, July 28, 2016. Double the number of military and police are expected to patrol during the games, compared to London in 2012, and while most will be concentrated at sporting venues, tourist landmarks will also be heavily patrolled. (AP Photo/Eraldo Peres)

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Rio Olympics Security Drill

Soldiers take part in an exercise drill, simulating their reaction to a chemical attack outside the National Stadium, which will host 2016 Summer Olympics soccer matches in Brasilia, Brazil, Thursday, July 28, 2016. Double the number of military and police are expected to patrol during the games, compared to London in 2012, and while most will be concentrated at sporting venues, tourist landmarks will also be heavily patrolled. (AP Photo/Eraldo Peres)

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Rio Olympics Security Drill

Soldiers hold their arms up as another practices using a machine that reads radiation levels, as part of an exercise drill simulating their reaction to a chemical attack outside the National Stadium, which will host 2016 Summer Olympics soccer matches in Brasilia, Brazil, Thursday, July 28, 2016. Double the number of military and police are expected to patrol during the games, compared to London in 2012, and while most will be concentrated at sporting venues, tourist landmarks will also be heavily patrolled. (AP Photo/Eraldo Peres)

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Brazil Rio Olympics Security

A soldier sprays another with water as part of an exercise drill, simulating their reaction to a chemical attack outside the National Stadium, which will host 2016 Summer Olympics soccer matches in Brasilia, Brazil, Thursday, July 28, 2016. Double the number of military and police are expected to patrol during the games, compared to London in 2012, and while most will be concentrated at sporting venues, tourist landmarks will also be heavily patrolled. (AP Photo/Eraldo Peres)

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Rio Olympics Security Drill

A soldier takes part in an exercise drill simulating security forces' reaction to a chemical attack outside the National Stadium, which will host 2016 Summer Olympics soccer matches in Brasilia, Brazil, Thursday, July 28, 2016. Double the number of military and police are expected to patrol during the games, compared to London in 2012, and while most will be concentrated at sporting venues, tourist landmarks will also be heavily patrolled. (AP Photo/Eraldo Peres)

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Brazil Security Doubts

FILE - In this July 21, 2016 file photo, a Brazilian marine rappels from a helicopter during a security training drill simulating a terrorist attack on a ferryboat ahead of the Olympics in Rio de Janeiro, Brazil. Brazil isn’t a newcomer to hosting mega-events. Every year it welcomes millions of foreign visitors during the weeklong Carnival celebration. But it has almost no experience fighting terrorism. The country has long prided itself on having an enemy-free foreign policy, one that rejects military intervention. (AP Photo/Leo Correa, File)

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