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 manage resources to protect a country's interests and maintain peace. In addition to combat roles, military institutions often engage in humanitarian efforts, disaster relief, and peacekeeping missions. They work closely with other government agencies and international organizations to address global security challenges. Overall, military institutions play a crucial role in maintaining national and international stability.