The term "Common Army" typically refers to a unified military force that represents multiple nations or groups, often established for collective defense or peacekeeping purposes. This concept is seen in organizations like the European Union or NATO, where member countries collaborate to enhance security and respond to threats. A Common Army can facilitate joint training exercises, share resources, and improve interoperability among different military units. By pooling their capabilities, member nations aim to deter aggression and maintain stability in regions facing conflict or unrest, ultimately promoting peace and cooperation among diverse nations.