Military institutions are organizations responsible for the defense and security of a nation. They include branches such as the Army, Navy, Air Force, and Marines, each with specific roles and responsibilities. These institutions train personnel, develop strategies, and maintain equipment to ensure readiness for various missions, including combat and humanitarian assistance. In addition to combat roles, military institutions often engage in peacekeeping, disaster relief, and community support. They work closely with government agencies and international organizations to promote stability and security. The structure of these institutions typically includes a hierarchy of ranks, ensuring effective command and control during operations.