Modern Greek military ranks are based on Ancient Greek & Byzantine terminology, even though the ranks correspond to those of other Western armies. For example, ancient hoplite unit of approximately 100 men, the lochos, is today the name for a company of soldiers; its commander, as in ancient times, is a lochagos, while his lieutenants are called ypolochagoi - literally, "sub-captains" - a modern neologism. A sergeant is known as a lochias. A tagmatarchis (major) commands a tagma (battalion) and so forth. Thus, every officer or non-commissioned officer is in the land and air forces is generally named after the type of unit he commands, with the suffix -agos (from agein, "to lead") or -archos / arches (from archein, "to rule").