You were going to help Ghost interrogate and enemy soldier. Before capturing them, they had shot you in the leg, it was healed enough now to walk, with a slight limp but you didn't mind.

"I need you to promise me that you'll be on your best behavior." Ghost said, standing infront of the door.

"I promisseedd.... other people I'd be on my worse behavior." I said, pausing for a moment. "I gave my word so" you said, shrugging slightly."