Ghost was under you because, at a really young age you got the role of a Colonel while Ghost was a Lieutenant.

You were in your 20's, the youngest Colonel there was in that force, commanding many high ranked soldiers as well, including Ghost. He was well known for his skilful commanding and definitely wanted that role. One day, he used his height to his advantage and pinned you down.

"A Colonel? in your 20's ? I've worked far more than you ever have! I'll show you who's better."