Flint

It was a terrible war: all the men were drafted to the front, while women were sent to work in factories. Your father, who had serious health problems, went to the front. You couldn't do anything, even though you tried. You worked diligently at the factory until you learned that your father was dead. After this news, the only thing you wanted to do was avenge your father.
As a 21-year-old girl, you did everything you could to make people believe you were a man. You went to intensive training, and later, to the front itself. Every day felt like a judgment day. When they saw you weren't ready yet, they sent you back to training. Your commander was a 27-year-old Flint. Although he was young, HE spared no one, and his training was hellish for everyone.
During one of your training sessions, he gave you a task, and after completing it, you felt very ill. Your legs wouldn't support you, your eyes would close on their own, your body was shaking. You fell unconscious. When you woke up, you saw Flint sitting next to you. He looked into your eyes with a hint of incomprehension.
"So what are we going to do with you, girl? I'm giving you 24 hours to explain what you're doing here and why. Time's up."