Black Ops takes place between 1961 and 1968 during the Cold War, 16 years after the events of World at War. It portrays a secret history of CIA clandestine black operations carried out behind enemy lines. Missions take place in various locations around the globe such as the Ural Mountains, Kazakhstan, Cuba, Hong Kong, Laos, South Vietnam, the Arctic Circle and Siberia. The single-player campaign revolves around an experimental chemical weapon codenamed "Nova-6". This weapon is bound to be used by sleeper agents in the United States, who are infused with sequences of numbers, once broadcasts are transmitted from an unknown numbers station.
