Wait I'm confused now. I thought Solidus Snake was the one from MG3 and the one who fought in the Vietnam War / Cold War.
Edit: No wait, that's not right either...
- Big Boss (whose original codename was Naked Snake, real name John) is the protagonist of MGS3. Portable Ops, Peace Walker, MGSV Ground Zeroes, and MGSV Phantom Pain. He did fight as an agent of the organization Fox, then Military Without Borders, then Diamond Dogs during the Cold War, presumably culminating in him being head of Foxhound. Big Boss then started a terrorist organization calling themselves Outer Heaven, and later on had a second uprising at Zanzibar. He has an eyepatch on his right eye after a wound from Ocelot.
- Solid Snake (real name David) is a clone of Big Boss born in the early 70s and is the protagonist of Metal Gear, Metal Gear 2: Solid Snake, Metal Gear Solid, Metal Gear Solid 2 (well, half-protagonist alongside Raiden), and Metal Gear Solid 4. He was a member of Foxhound and subsequently a terrorist organization known as Philanthropy. He has no eyepatch but wears the Solid Eye device on his left eye during MGS4.
- Liquid Snake (real name presumably Eli) was Solid Snake's twin, also a clone of Big Boss, and was the main antagonist of Metal Gear Solid and technically makes an appearance in Metal Gear Solid 2. He became a member of Foxhound after Solid left and started a terrorist organization calling themselves the Sons of Big Boss. No eyepatch.
- Solidus Snake (real name George) is the last clone of Big Boss and is actually younger than both Solid and Liquid but appeared older due to even more severe accelerated aging. He is the main antagonist of Metal Gear Solid 2 and made an appearance in
. He was president of the United States at one point and after leaving office started a terrorist organization calling themselves the Sons of Liberty. He has an eyepatch on his left eye after a fight with Raiden.
learn2metalgear