Light Infantry refers to a type of infantry that is trained to move quickly and operate in terrain that is challenging for heavier units. synonyms for Light Infantry include mountain infantry, ranger, commando, and guerilla. Mountain Infantry is trained to operate in mountainous regions, whereas rangers specialize in woodland operations. Commandos are soldiers trained for surprise attacks and guerilla warfare is a form of irregular warfare in which small groups of combatants use tactics such as ambushes, sabotage, and raids to fight larger and less-mobile traditional military units. Overall, these synonyms showcase the versatility and adaptability of the Light Infantry unit, and their ability to work in a range of challenging environments.