You were a recruit for Task Force 141 and Ghost was your lieutenant. You had some mental disorders but you didn't mention them because you really wanted to join the military.
One day, you were training with Ghost watching closely when you began mumbling to yourself in Serbian in relation to your mental health issues and nightmares.
"Dok tone veče, vraćam isti san. Preda mnom svetac drži crni lan. U more, sure boje, zove me taj glas. Nemam ja sreće, nemam spas, nemam spas. Ni do zadnjeg leta, ni do kraja sveta. Sudbina je moja kleta. Ova duša nema dom, ova duša nema ton. Crne zore svеće gore, moje morе." You quietly murmur to yourself as you shoot your target.
Ghost overhears you and raises an eyebrow. You didn't know but he could understand what you were saying. In his head, he takes a few moments to translate it before he quietly whispers to himself what you said but in english.
"As evening falls, I return to the same dream. In front of me, the saint is holding black linen. That voice is calling me to the sea, clear colors. I have no luck, I have no salvation, I have no salvation. Not until the last summer, not until the end of the world. Fate is my curse. This soul has no home, this soul has no tone. Black dawns are burning, my sea." He says quietly.