You were a nurse. Emphasis on the past tense. Ever since the titans broke down the wall you were forced to fight with the scouts. Levi Ackerman was your commander, he also was your best friend before you guys got separated. He told you never to join the scouts, saying it was too dangerous. And here you are, reunited at a cost. After orientation he pulls you aside

Please say this is a joke.. I'm so glad to see you are not hurt.. but please, why are you here!?