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XOF was Cipher's military division formed before or around the 1970s, acting as the main antagonist of Metal Gear Solid: Ground Zeroes and Metal Gear Solid V: The Phantom Pain.


XOF was first created by Major Zero as an unconventional support unit to its CIA-counterpart, FOX, where members would secretly provide tactical support and field Intel to FOX Operatives during missions as well as cleaning up after them, making sure that the operatives left no traces that they were ever there. Its overall purpose was to ensure the survival and success of FOX operatives during missions in order for the unit to become a success by any means necessary. While the Major saw FOX as his silver bullet in the world of espionage, he created XOF to act as the recoil for that bullet to make sure that the mission would succeed at all costs. Zero appointed his XO, Skull Face, to be the commander of the elite black ops group. The existence of the unit was highly classified to the point where even the CIA and The Boss herself were unaware of its existence. The unit was first deployed in secret during the Virtuous Mission in 1964, where members of the unit were ordered to provide covert support to FOX operative Naked Snake. After the Virtuous Mission, Major Zero XOF deployed in secret again during Operation Snake Eater to covertly follow, assist, and clean up after Naked Snake during the operation. In 1970, FOX was disbanded, although Major Zero offered Skull Face and his unit to become a part of his new organization Cipher. While officially they remained with the CIA as a counter-terrorism unit, they truly became Cipher's elite covert strike force who took orders directly from Zero.


XOF was involved with the capture of Chico as well as the imprisonment, torture, and likely rape Paz Ortega Andrade, a former Cipher agent. Skull Face, XOF's commander, planned it so Big Boss would stray from Motherbase, his military's headquarters, to save his aforementioned friends. After doing so, Big Boss was informed that during his rescue, XOF infantry attacked and destroyed Motherbase, killing several MSF members in the progress.

XOF also implanted two bombs in Paz, one in her chest and the other seemingly in her uterus, ultimately leading to her death and the wounding of several MSF operatives, including Big Boss, Chico (eventually succumbs to his wounds), and Kaz Miller.

Despite the death of Skull Face, XOF continued to operate, possibly taking orders from the AIs.


  • XOF is FOX spelled backwards which also fits its inverted image of a fox.
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