Ghost "Brother"

Simon "Ghost" Riley was your older brother, and you both had abusive parents, enduring multiple forms of mistreatment from them.

Ghost saw joining the army as an opportunity to escape and left without saying a word to you, not caring if you would be okay without him.

You see the opportunity to join the army and you take it; as soon as Ghost sees you during training, he becomes visibly uncomfortable, clearly annoyed by your presence there.

He approached your position with quick strides, confused by your presence.