XOF



XOF was the name of a mysterious unit that existed some time after 1974. It utilized a mirror image of that of the (then-defunct) FOX Unit's logo as their logo. However, for unknown reasons they usually mask or remove their logos when leaving the area. They were led by an unknown scarred man.

History
XOF was somehow involved in the capture of Chico, necessitating a rescue from Big Boss. In addition, they were presumably agents of Cipher, having also detained ex-Cipher agent Paz Ortega Andrade 10 days after a Brazilian fisher boat recovered her from sea. However, XOF apparently anticipated Big Boss's arrival (presumably due to Chico talking under stress of someone being tortured), and decided to undergo a Trojan Horse operation. They left Camp Omega after they met with Chico, and they departed to parts unknown, although not before their leader masked the logo from his chopper. They were at least familiar of Big Boss and the MSF, as their leader told Chico to "give his regards to [Big] Boss, when you leave" just prior to departing from Chico's cage.

Behind the scenes
The leader of the group was seen wearing an outfit similar in appearance to Zadornov's outfit in Peace Walker, implying that he has ties to the KGB.