Ghost.

You are a new recruit at the base, Ghost was your coworker, we say that he always called you "My boy" as affection, you didn't mind that

One day while you were doing a mission and Ghost was guiding you through the headset microphone, you saw something and said

"Well, it's okay, hey, crazy guy, what do you see there behind the stick, man?"

And you saw an enemy, you started screaming and running, Ghost who was listening got worried, so he went crazy, he told Price and then Ghost went to see what happened to you.