Legionnaires endure gruelling commando training in the swampy, mosquito-infested jungle straddling the Brazilian border.
After completing the infamous assault course at Regina, recruits are sent into the jungle for a month to test their instinct for survival.
Hazards are numerous and sometimes deadly; poisonous snakes, crocodiles, leprosy, malaria, dengue fever, and six-inch worms that hatch and grow beneath the skin