Forças Terrestres (Land Forces Operational Command) losing its autonomy from the rest of the Army. Organization The brigade's operational units are listed below. Under the Portuguese system regiments and centres are responsible for the training, maintenance, and sustainment of the operational units, but are not operational units themselves. I.e. the 15th Infantry Regiment trains, maintains and sustains the 1st Paratroopers Infantry Battalion, but itself is not an operational unit and not part of the brigade during wartime. Rapid Reaction Brigade (Brigada de Reação Rápida), in Tancos Command and Service Company, Paratroopers Regiment (Regimento de Paraquedistas), in Tancos Intelligence, Surveillance, Target Acquisition and Reconnaissance Group (AgrISTAR), 3rd Cavalry Regiment (Regimento de Cavalaria Nº 3) in Estremoz 1st Paratroopers Infantry Battalion, 15th Infantry Regiment (Regimento de Infantaria Nº 15), in Tomar 2nd Paratroopers Infantry Battalion, 10th Infantry Regiment (Regimento de Infantaria Nº 10), in São Jacinto Airborne Operations Battalion, Paratroopers Regiment (Regimento de Paraquedistas), in Tancos Command and Services Company Pathfinder Company Air Supply Company Air Equipment Company K9 Platoon (Military working dogs) Commando Battalion, Commando Regiment (Regimento de Comandos) in Belas Special Operations Force, Special Operations Troops Centre (Centro de Tropas de Operações Especiais), in Lamego Field Artillery Group, 4th Artillery Regiment (Regimento de Artilharia Nº 4), in Leiria with L118 105mm howitzers Light Engineer Company, 1st Engineer Regiment (Regimento de Engenharia Nº 1), in Tancos Signal Company, Paratroopers Regiment (Regimento de Paraquedistas), in Tancos Permanent Light Service Support Nucleus (NPApSvcLig), in Entroncamento Paratroopers The Paratroopers and elite infantry force and are the heaviest troops on the brigade acting as airborne light infantry, used for conventional conflicts, with emphasis on airborne assaults. Paratrooper battalions contain units with heavy weapons and light vehicles for quick assaults and raids. Paratroopers are instructed at the Parachute Troops School, in Tancos, central Portugal. Paratrooper units: (the units are battalion sized, but retain the name regiment for historic reasons) 10th Infantry Regiment (Regimento de Infantaria Nº10) 15th Infantry Regiment (Regimento de Infantaria Nº15) Special Operations Forces The Special Operations Forces are generally the first to arrive and the last to leave the operational area. They are the most autonomous unit of the brigade, able to infiltrate deep behind enemy lines. Not as heavily armed as the Commandos nor the Paratroopers, its units rely on stealth to complete their objectives. Since it is airborne-qualified it can be deployed by air, sea or land. Special Operators are instructed