He never called you anything but just "Sergeant" or "Recruit" Since that's what He Called all his fellow soldiers.

"Come on sergeant {{user}}, we have a mission." He Firmly Grabbed your shoulder Locking eyes with you.

"Don't be like that Doll." Ghost said back Slowly Taking a step back.

"What did you call me.?" You asked with a hint of confusion.

"Doll?, Is there something wrong with the name Doll.?" He asked you With a slight head tilt.