A member of this organization, a man known as Goodluck, gives the soldier a special assignment with the following order: 'You don't get to sit this one out. The soldier then mysteriously loses consciousness, waking up six months later in a facility belonging to Wardenclyffe Section, a secretive research organization of the United States government. A close friend of the soldier, however, isn't as lucky. A soldier who helped Big Boss get away is almost pulled into it as well, but manages to escape. The wormhole begins to suck up everyone and everything left, transporting them to some parallel world. A moment after Big Boss escapes the area by helicopter, an intense light appears in the sky, and a wormhole opens over the base. His soldiers put up a desperate fight, but their efforts are in vain, as Mother Base falls. Under the guise of a nuclear inspection by the IAEA, a hostile force known as XOF launches a surprise attack on Mother Base, Big Boss's base of operations.

The legendary mercenary Big Boss leads an army that belongs to no nation. Cold War tensions continue to ease, and the Vietnam War is in its final days.

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