Game, a BBC television film written, directed, and produced by Peter Watkins was a Cold War piece of a darker nature. The film, depicting the impact of Soviet nuclear attack on England, caused dismay within both the BBC and in government. It was originally scheduled to air on August 6, 1966 (the anniversary of the Hiroshima attack) but was not transmitted until 1985. In the 2011 superhero film, X-Men: First Class, the Cold War is portrayed to be controlled by a group of mutants that call themselves the Hell Fire Club. In the summer of 1976, a mysterious and seemingly very powerful signal began infiltrating radio receivers around the globe. It has a signature 'knocking' sound when heard, and because the origin of this powerful signal was somewhere in the Soviet Union, the signal was given the nickname Russian Woodpecker. Many amateur radio listeners believed it to be part of the Soviet Unions over-the-horizon radar, however the Soviets denied they had anything to do with such signal. Between 1976 and 1989, the signal would come and go on many occasions and was most prominent on the shortwave radio bands. It was not until the end of the Cold War that the Russians admitted these radar pings were indeed that of Duga, an advanced over-the-horizon radar system. The 2004 video game Metal Gear Solid 3: Snake Eater is set in 1964 and deals heavily with the themes of nuclear deterrence, covert operations, and the Cold War. The 2010 video game Call of Duty: Black Ops is set during this period of the Cold War. Significant documents Partial or Limited Test Ban Treaty (PTBT/LTBT): 1963. Also put forth by Kennedy; banned nuclear tests in the atmosphere, underwater and in space. However, neither France nor China (both Nuclear Weapon States) signed. Nuclear Non-Proliferation Treaty (NPT): 1968. Established the U.S., USSR, UK, France, and China as five "Nuclear-Weapon States". Non-Nuclear Weapon states were prohibited from (among other things) possessing, manufacturing, or acquiring nuclear weapons or other nuclear explosive devices. All 187 signatories were committed to the goal of (eventual) nuclear disarmament. Anti-Ballistic Missile Treaty (ABM): 1972. Entered into between the U.S. and USSR to limit the anti-ballistic missile (ABM) systems used in defending areas against missile-delivered nuclear weapons; ended by the U.S. in 2002. Strategic Arms Limitation Treaties I & II (SALT I & II): 1972 / 1979. Limited the growth of U.S. and