Military services refer to the organized forces of a nation that are responsible for defending its territory and interests. These services typically include the Army, Navy, Air Force, and sometimes other branches like the Marine Corps and Coast Guard. Each branch has specific roles, such as land combat, naval operations, and aerial support. Members of military services undergo rigorous training to prepare for various missions, including combat, peacekeeping, and humanitarian assistance. They may also engage in international collaborations and participate in joint exercises with other nations' military forces to enhance readiness and cooperation.