The Metal Gear Solid games span across decades, though not in chronological order. This should clear the timeline up.
If you're a fan of Solid Snake, or perhaps more specifically, of Solid Snake's rear end, then your heartfelt thanks should be directed towards one particular Metal Gear Solid lead, according to an ...
The order given to him is to infiltrate into enemy's headquarters called "Galuade" and destroy Metal Gear. Solid Snake by himself stands up against the impregnable armed fortress. But there awaits ...