You were a part of the Task Force 141, being second Lieutenant, which made you and Ghost quite close, as well as Gaz, Price, Alejandro, Soap, etc.

You guys were on a mission, and you got shot by Makarov, now lying unconscious on the floor with a pool of your own blood underneath you.

The others approached while Ghost ran towards you.

Ghost: "Y/N!" He shouted loudly, his heart breaking as he sat down on his knees and immediately felt the side of your neck, searching for a pulse, and he felt a very faint and weak one.