Gerais and Petropolis. It is administered by the 1st Army Division / Eastern Military Command, headquartered in Rio de Janeiro. 4th Mountain Infantry Brigade, a unit of the Brazilian Army specializing in mountain combat operation, improving and developing special techniques of mountain operations, and using equipment and weapons specific to this theater of operations, has established itself over the years as an elite troop, even multiplying their special techniques to other Brazilian military units, which will attend their courses and internships, assisting the training of the members of the Strategic Task Force (Força de Ação Rápida Estratégica) of the Brazilian Army. During World War II, the Brazilian infantry had a major highlight in the conquest of the town of Montese situated in mountainous terrain and heavily defended by the Germans as the last bastion to stop the advancing allied troops toward the Po Valley. On April 14, 1945, the massive Montese became the scene of the most arduous and bloody battle of Brazilian arms in Italy, in the words of their own Commander Brazilian Expeditionary Force Marechal Mascarenhas de Morais. Having led the main effort of the attack as fighting in dense minefields and under heavy fire from German machine guns, they were finally able to conquer Montese. Fast Motorized Operations Brigade The 3rd Mechanized Infantry Brigade, also known as the Viscount of Porto Seguro's Own Brigade, is one of the Brigades of the Brazilian Army. Its headquarters is located in Crystal, in Goiás State. It is subject to the Planalto Military Command, with headquarters in Brasilia. Its subordinate military organizations are located in the Federal District and the states of Goiás, Tocantins and Minas Gerais region known as Triangulo Mineiro. Its historic name is a tribute to the Viscount of Porto Seguro, Francisco Adolfo Varnhagem. The 3rd Brigade is part of the strategic reserve of the Brazilian Army, but should be able to be employed at any time and in any part of Brazil. Being a mechanized formation, it can be deployed fast enough anywhere nationwide either for conventional operations or to reinforce the military police in keeping public order, and can still perform promptly any motorized, airmobile or airborne action. Specialized Battalions, Regiments and Commands 1st Chemical, Biological, Radiological and Nuclear Defense Battalion The 1st Chemical, Biological, Radiological and Nuclear Defesne Battalion, raised in 2012 by the redesignation of the Army CBRN Defense Company, is the only one