From the Metal Gear Wiki

Operation Intrude N313 was the mission name given to the FOXHOUND operation that took place during the Outer Heaven crisis. This mission was commanded by Big Boss. This operation was Solid Snake's first real mission as a member of FOXHOUND, and it's two main objectives were to rescue Gray Fox and destroy Metal Gear TX-55. The events of this operation are chronicled in the MSX game, Metal Gear.

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