Our parish is an ethnic personal parish ( not a territorial parish). It was created by the Archdiocese to serve the needs of a particular ethnic community and language.
As such, are parish is staffed by priests from Eastern Europe. They are diocesan priests, but are incardnated in an Eastern European archdiocese, not the archdiocese of Detroit.
We have a pastor who has been here for many years, and we get in associate pastors on duty from 1-3 years. They are generally sent here to improve their English skills.
From my mission trips to Tanzania, I know of one priest there who is from Sicily. He went there on a mission retreat. He spent some time at a parish and found a calling to stay. He asked his bishop for permission to stay longer. That was several years ago. Each year, his bishop renews permission for him to remain in Tanzania.
(that was a great parish to visit, he has a pasta machine and a tomato garden. He feeds us mostacholi , that is a welcome relief from the rice and bananas we get all time everywhere else.)