Then, if they get old or sick or are surplus to requirements, they will be unceremoniously dumped with no unemployment benefit, health insurance or pension.
Oh, but the WT has lovingly provided advice on "Adjusting To A New Assignment". Things like pray more, go door knocking more, don't try to be financially secure, others can give you money or material belongings, remember this life is only temporary and you will be in paradise forever...SOON.
What a load of horse---t!