of its kind in the Brazilian Army, and its members are trained for combat in chemical, biological and nuclear warfare (as the name suggests), mainly in control and decontamination of weapons, local and military equipment. The battalion's origin dates back to 1953, when the Chemical Warfare Company, originally subject to the Reverse Split Units-School (RSUS) was set up on the premises of the Special Education School (SES) On December 31, 1987, the Chemical Warfare School was extinguished and, in its place, the CBRN Company was created, based in the city of Rio de Janeiro and subordinated to the Board of Specialization and Extension. 17th Border Battalion (Swamp Operations ) The 17th BB is an elite unit of the Brazilian Army, specializing in swamp operations that is located in the city of Corumbá, state of Mato Grosso do Sul. Its main missions, ensuring the western border of Brazil, the development and improvement of technical and operational doctrines and special combat specific swampy environment (present in many places in the world) and also multiply its technical operations in wetland units members Strategic Task Force (Força de Ação Rápida Estratégica)of the Brazilian Army, but specifically, offering a course of Wetland Operations (Operações no Pantanal) to the Special Operations Brigade, Parachute Infantry Brigade and the 12th Light Infantry Brigade (airborne), units within the Strategic Task Force, and also military from other regions, particularly the Western Military Command, which is responsible for the protection of the western border of the Brazilian territory. Besides that, there are also exchanges of techniques and experiences with the Brazilian Marines, which also apply to the Wetland Operations course and are remarkably skilled in amphibious operations. 72nd Motorized Infantry Battalion (Caatinga/Savanna Operations) The 72nd MIB is an elite unit of the Brazilian Army based in Petrolina, being the only unit of the Brazilian Army to train the warfighter to the operating environment of Caatinga and Savanna. The Caatinga Operations Instructions Center, covering an area of approximately 28,000 km2, is within the territory of the battalion. The facilities of the Caatinga Operations Instructions Center are comprised in an area which belongs to the Ministry of Defence, named the Field Instruction Iron Tank Farm, responsible for the formation of the Caatinga battle combatant in this environment. The vegetation is aggressive and thorny, the sun is very harsh for most of the daytime and water is sparse. The conditions of this area are