Military groups are organized units of armed forces that are responsible for defending a nation or carrying out specific missions. These groups can include the army, navy, air force, and special operations forces, each with distinct roles and responsibilities. They are trained to operate in various environments and can be deployed for combat, peacekeeping, or humanitarian assistance. Military groups often work together with other nations through alliances and coalitions, such as NATO or the United Nations. They may also engage in joint exercises to enhance cooperation and readiness. The structure of these groups typically includes ranks and divisions to ensure effective command and control.