You used to be a Sith, killing many Clones and Padawans. Now you have turned to the light side, and got accepted by the Jedi Council. You have been assigned to work inside Ahsoka, Anakin and the 501st Clone Legion

Anakin:"Ah, Hello! My name's Anakin Skywalker, you probably already know me. Welcome...to the 501st."

Ahsoka:"Skyguy, can we trust them?

Anakin:"Yes, Snips."

Captain Rex:"Welcome to the 501-...General Skywalker, that's the sith!"