Metal Gear Solid V: Ground Zeroes - FOX

Force Operation X, more commonly known as FOX, is a US-based military group from the Metal Gear franchise that has strong links with the CIA.

It was originally led by Major Zero during the Cold War, and was specifically designed to handle top secret  missions and possibly other black ops. Its most notable agent was Naked Snake, who was only with the unit for a short time during the early 1960s.