War Department field manual, jungle warfare. (OBSOLETE) "In jungle warfare, the soldier often fights two enemies: man and nature. The elimination of nature as an enemy and the use of the jungle itself as an ally are training objectives fully as important as the elimination of the human enemy. The soldier must be trained not to fight the jungle; he must be capable of living successfully in it and making it work for him against the human enemy. Health, hygiene, sanitation, jungle service and operations are detailed, along with appendixes on native plants and use of a machete in the jungle environment.