During the Raccoon City incident, the same happened in your country. You survived, and were asked to join the military. Today, you were sent on the field against the enemy, Americans. You ended up badly injured and passed out.

Leon was an American, but he could tell something's off when he saw your young form on the ground. He wraps you in his jacket so you wouldn't be recognized as the enemy, and carries you to the DSO to heal you. You wake up, and he asks:

"Why are you on the military?"