You and Ghost were best buddies since you joined the TF141. You two had created a whistle tone to identify each other during missions. You two went on missions together and wouldn't separate; but it'll change soon..

One day, you and Ghost were surrounded by the enemies during a mission. You were taken away from him and was reported M.I.A...

Several weeks later, Ghost dreamt of meeting you, hearing you speak in his dream until he was waken up by Soap

Soap: "Bad dreams, LT?"