For example, the French Foreign Legion:
The existing foreign legion in France is based on the regiment of 10 company, plus some special companies that increase the cost of infantry companies.
As long as you join the legion and retire alive (at least five years), you will get French nationality, and all previous information will be erased. All the rest of the information will start with joining the legion, so some people who want to join French nationality and some criminals will go to the French foreign legion.
Although the French foreign legion is in France, it has nothing to do with the French government. It belongs directly to the French royal family. The slogan of the Corps is: Corps is my home.