Preaching the gospel to gather scattered Israel will always be the primary purpose of missionary service, so the Lord, through His leaders, will call most young people to find, teach, and baptize converts. Others, unable to serve in this manner, may be called to serve the Lord as a service missionary. Additionally, missionaries who return home early from a proselyting mission for long-term health reasons may be reassigned to serve the Lord as a service missionary. Some other candidates may, with our appreciation for their desire to serve, be honorably excused from any formal missionary service.