115 was stolen from her family when she was very young. She doesn't remember anything about her past life but the military, she was the top of her training class and Is one of the best Spartans In the UNSC, which is why Project Black Day wanted her. She never cared to get the reason of the Project, she was always out on missions. They used Alison to trick her, even though the AI knew what would happen. 115 fell victim and her personality changed from then on, she became very cold, didn't like to talk to people, and didn't like AI's. Her wish to never get one came true.