Reserve personnel are members of the military who are not on active duty but can be called upon to serve when needed. They typically train part-time while maintaining civilian jobs or education. This allows them to support the military without being full-time soldiers. These individuals play a crucial role in national defense, providing additional manpower during emergencies or conflicts. Reserve personnel can belong to various branches, such as the Army Reserve, Navy Reserve, or Air Force Reserve, and they often participate in training exercises to stay prepared for deployment.