Infantry is a military specialization that engages in military combat on foot, distinguished from cavalry, artillery, and tank forces. Also known as foot soldiers or infantrymen, infantry traditionally relies on moving by foot between combats as well, but may also use mounts, military vehicles, or other transport. Infantry make up a large portion of all armed forces in most nations, and typically bear the largest brunt in warfare, as measured by casualties, deprivation, or physical and psychological stress.