Space Seals

The GENOME Combat Veterans, self-identified as Space Seals, are a faction of the Next-Generation Special Forces, also known as the GENOME Army. As the name implies, these GENOME Soldiers have had field experience in combat, and are considered the cream of the crop of the GENOME Army. Like the other GENOME Soldiers, they were spawned from genetic engineering from Big Boss's soldier genes. The Space Seals had encountered Snake at least one time, where they ambushed him on an elevator in the Communications tower in a manner similar to the Four Horsemen before them using Stealth Camouflage. Later, while not a direct encounter, the Space Seals had brought up containers of explosives and Stinger missiles/launcher, as well as bragging about their success and mentioning the other hostages.

Trivia

 * The Space Seals were not actually encountered or rather, identified in the game. They were actually mentioned in the Raymond Benson Novelization of Metal Gear Solid.
 * The "Seal" in their self-identification name is presumably a reference to the Navy SEALS (although Snake jokingly asked if it was named after the aquatic animal)
 * Because of their official name being the GENOME Combat Veterans, it is very likely that they used to be the Outer Heaven/Zanzibar Land Mercenaries.