Light infantry forces typically rely on their ability to operate under restrictive conditions, surprise, violence of action, training, stealth, field craft, and fitness levels of the individual soldiers to address their reduced lethality. Despite the usage of the term "light", forces in a light unit will normally carry heavier individual loads versus other forces; they must carry everything they require to fight, survive and win due to lack of vehicles. Although units like the 101st Airborne (Air Assault) and the 82nd Airborne Division are categorized as Air Assault Infantry and Airborne Infantry respectively, they fall under the overall concept of light infantry. They are typically infantry intended for difficult terrain such as mountains or arctic conditions (US Marines) (Royal Marines, United States Army 10th Mountain Division, United States Army 86th Infantry Brigade Combat Team (Mountain), Italian Army Alpini, French Army 27ème bataillon de chasseurs alpins) or jungle (Philippine Army Scout Rangers, Brazilian Army Jungle Infantry Brigades).