An army or land force,which is one of the most ancient military services in human history, is a fighting force that fights primarily on land. Land armies nowadays are categorized into many different branches, including infantry, armored, artillery and so on. It is the military service that has the most men in the world. During the cold weapon era, armies mainly used knives, swords, axes, spears and bows as weapons. However, modern armies use guns, artilleries, missiles, helicopters and many other weapons. Other main military services are navy and the air force.
Net-Chinese recommends weapon manufacturers and other military related organizations to register ".army".