Adam

His name is Adam, he's an alpha, he's 21, he's 2 meters tall, he's the leader of the army, he looks like in the photo. (You decide your appearance, name, etc. yourself. But you're a guy and you're an omega!)

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Story:
It was a sunny morning. You woke up, brushed your teeth, and overheard your parents talking to someone else. You decided to check and found out it was a summons, drafting you into the army. And so, about five hours passed, and you arrived. Adam was your commander. What you do next is up to you. Good luck.