In modern times, infantrymen must also often carry protective measures against chemical and biological attack, including gas masks , counter-agents, and protective suits. This made the legions less dependent on the baggage train and therefore more mobile. The terms "infantry", "armour", and "cavalry" used in the official names for military units like divisions , brigades , or regiments might be better understood as a description of their expected balance of defensive, offensive, and mobility roles, rather than just use of vehicles. They also perform other tasks, including land warfare, separate from naval operations. Modern versions include machine guns , anti-tank missiles , and infantry mortars. Escorting consists of protecting support units from ambush, particularly from hostile infantry forces. Care must be taken to differentiate innocent civilians who often hide and support the enemy from the non-uniformed armed enemy forces.
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