Four Horsemen

Ultra Box is an assasination squad employed by Zanzibar Land that specializes in close-quarter combat. They are comprised of former elite members of UDT, GSG-9 and SAS. They used the advantage of increased weight inside elevators to their advantage.

Story
They fought against [Solid Snake during Operation Intrude F014 in an elevator inside Tower Building under the direct orders from Gray Fox and Big Boss.