Eg. Europe since rifle introduce got no affordable armor that can stop bullets at any range and had all gunman infantry. Till 18th century, Asia, had armor that can stop even more powerful bullets at same range, but got weapon that can penetrate the armor, but only at closer ranger. As a result, Asia used swordsman and rifleman combined infantry till 18th century. With increase armor making long range penetration harder, could melee combat become increasing in future wars?