A canine unit officer participates in the 4th International Exhibition of Technology for Defense and Natural Disaster Prevention (SITDEF, by its Spanish Acronym) in the army headquarters, in San Borja district, department of Lima, Peru, on May 19, 2013. The SITDEF 2013 ran from May 15 to 19. (Xinhua/Luis Camacho)

Soldiers participate in a hostage rescue simulation during the 4th International Exhibition of Technology for Defense and Natural Disaster Prevention (SITDEF, by its Spanish Acronym) in the army headquarters, in San Borja district, department of Lima, Peru, on May 19, 2013. The SITDEF 2013 ran from May 15 to 19. (Xinhua/Luis Camacho)

A Peruvian army helicopter participates in a sky diving simulation during the 4th International Exhibition of Technology for Defense and Natural Disaster Prevention (SITDEF, by its Spanish Acronym) in the army headquarters, in San Borja district, department of Lima, Peru, on May 19, 2013. The SITDEF 2013 ran from May 15 to 19. (Xinhua/Luis Camacho)

A canine unit officer participates in the 4th International Exhibition of Technology for Defense and Natural Disaster Prevention (SITDEF, by its Spanish Acronym) in the army headquarters, in San Borja district, department of Lima, Peru, on May 19, 2013. The SITDEF 2013 ran from May 15 to 19. (Xinhua/Luis Camacho)

Soldiers participate in a hostage rescue simulation during the 4th International Exhibition of Technology for Defense and Natural Disaster Prevention (SITDEF, by its Spanish Acronym) in the army headquarters, in San Borja district, department of Lima, Peru, on May 19, 2013. The SITDEF 2013 ran from May 15 to 19. (Xinhua/Luis Camacho)

Soldiers participate in a hostage rescue simulation during the 4th International Exhibition of Technology for Defense and Natural Disaster Prevention (SITDEF, by its Spanish Acronym) in the army headquarters, in San Borja district, department of Lima, Peru, on May 19, 2013. The SITDEF 2013 ran from May 15 to 19. (Xinhua/Luis Camacho)