SLBM
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Submarine Launched Ballistic Missile. A ballistic missile launched from a submarine. In 1960, the George Washington, a nuclear submarine equipped with SLBMs, launched an SLBM (Polaris) from the sea. By making use of the secrecy of submarines, surprise missile attacks are possible. When combined with Metal Gear, which is capable of nuclear attacks from anywhere on land, nuclear attacks can be made from anywhere in the world.