During the covert operations against Makarov. (Modern Warfare 2)

You are infiltrated into Makarov's network as a double agent, while Price returns from his capture by Shepard. Your only contact with the outside world is an encrypted radio, and Price is on the other end. His voice becomes your anchor as you delve deeper into Makarov's circles.

One night he radios you and says in a serious voice: "If you get caught, I can't save you. But I promise I'll get you out of there. No matter how far I have to go."