"", which is chronologically the first game in the series, introduces "Naked Snake" (or "Snake" for short), an operative working for the fictional "Force Operation X (FOX)" unit of the CIA during the Cold War. The game focuses on the rise of Snake from an apprentice to a legendary soldier, as well as the downfall of his mentor and matriarchal figure, The Boss. After The Boss defects to the Soviet Union, Snake is sent into Russia to kill her and end the threat posed by Yevgeny Borisovitch Volgin, a GRU colonel with plans to overthrow the Soviet government. Snake's heroics during the game earn him the nickname "Big Boss" at the end. The origins of The Patriots, an organization founded by Zero, are also explored.