*SPOILER ALERT* Spoilers for the entire Metal Gear Solid series follow. Read at your own risk!
Naked Snake, now known as Big Boss, was a growing legend in the black ops world after his exploits in Russia in 1964. After killing his mentor, The Boss, Naked Snake ended up fighting in various regional conflicts around the world, including Mozambique in 1966. Sometime in 1970, Big Boss was captured by his former unit, FOX. The unit had gone rogue, and was looking for the Philosopher’s Legacy.