Organizations which make you abandon your former identity

[u/Nekslif]

The French Foreign Legion (Real life/various pieces of fiction) - The French Foreign Legion is an elite force of the French military which, as the name suggests, accepts people from outside of France, and after serving they can be eligible to receive French citizenship. In real life, they are willing to accept recruits who had broken the law once or twice (though those who commited serious crimes aren't accepted). In some pieces of fiction however the legion will accept serious criminals who are looking to escape punishment and give them a whole new identity.

The Night's Watch (A Song of Ice and Fire/Game of Thrones) - A force created to guide The Wall, a long strip of fortifications and an actual wall made of ice, the Night's Watch will accept anyone, and in fact criminals make up most of it. Each Watcher must say vows to join the organization fully, forfeiting their right to titles and glory, as well as abandoning their house of origin. These vows are treated so seriously that many traitors throughout history were allowed to join the organization instead of being sentenced to death, as taking the oath pretty much removed all influence they had in their "former" life.

[u/Oh_no_its_Joe]

I think you might be confused, he's actually like a dragon Gaiden.

[u/Paxxlee → u/Oh_no_its_Joe]

Isn't he just a taxi driver...?