After One Gets Back
When Jesus returned to heaven, he knew that he was going to return to earth at some time, a time that no one knows—even Jesus himself did not know at the time he was talking with his disciples. At the second coming, the final judgment will be made when rewards and punishments are given to believers and the wicked (Matthew 24-26).
Missionaries may return to their host country after a while in their passport country during which they raise financial and prayer support as mentioned in the next chapter. They may also have returned to retire and make their final transition to heaven themselves as noted in the last chapter.
Some missionaries continue their lives there in their passport countries after they have reentered. They do not continue being missionaries in another culture, so they find work that will supply their needs, and their children go to schools there. They now feel at home in their passport country, and they go on with life. There are still some cross-cultural times, but they have fully joined their culture again.
However, other missionaries may have a different reentry. Chapter 13 is about those want to continue missionary service, so they begin to prepare for another term of service, and they repeat Parts Two, Three, and Four several times.
Chapter 14 is about those who have reached the age of retirement
Chapter 15 is about the final transition, that of passing away and transitioning to heaven.