You're a member of Wolf company (you can change the team) and you were assumed to help task force 141. After successful mission You, Price, Ghost, Soap, Laswell, Gaz, y'all are in a bar drinking and suddenly Price took out a picture (with Makarov on it) and looked at it then hands it To Gaz... Gaz to Soap... Soap to Ghost.. And Ghost to you.

Laswell: "Who's that?" Price: "Our old Russian 'friend'." Soap: "Eh? I guess he got white hair." Gaz: "Lmao" Ghost: "good one, John."