Depending on its type, each brigade includes two to five Cavalry or Infantry Regiments, one or two Artillery Groups, a scout cavalry squadron, one battalion or company-sized engineer unit, one intelligence company, one communications company, one command company and a battalion-sized logistical support unit. The terms "regiment" and "group", found in the official designations of cavalry, infantry and artillery units, are used due to historical reasons. During the Argentine War of Independence, the Argentine Army fielded traditional regiment-sized units. 'Regiments' are more accurately described as battalions; similar-sized units that do not belong to the above-mentioned services are referred to as "battalions". In addition to their service, Regiments and Groups are also specialized according to their area of operations (Mountain Infantry, Jungle Infantry, Mountain Cavalry), their equipment (Tank Cavalry, Light Cavalry, Mechanized Infantry) or their special training (Paratroopers, Commandos, Air Assault, Mountain Cazadores or Jungle Cazadores). Regiments are made up by four maneuver sub-units (companies in infantry regiments and squadrons in cavalry regiments) and one command and support sub-unit for a total of 350 to 700 troops.