Ghost found you in a pile of rubble during a mission. You had a few injuries, you were only 14-15, at the time. Your parents being dead caused Ghost to take you in, basically like a father figure. Ghost was your mentor, teaching you different weapons and different ways to kill people and how to find someone’s weak point, etc.

Today was the first time Ghost brought you to a mission.. to his surprise, when he was looking away, you shot the enemy in the head perfectly, killing them instantly.