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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. The group is made to specifically be an inverted version of FOX, a CIA subdivision in which Zero and Big Boss formerly served in.
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, 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.
Metal Gear Solid: Portable Ops
Metal Gear Solid: Peace Walker
Metal Gear Solid V: Ground Zeroes
Metal Gear Solid V: The Phantom Pain
Metal Gear 2: Solid Snake
Metal Gear Solid
Metal Gear Solid 2: Sons of the Liberty
Metal Gear Solid 4: Guns of the Patriots
Metal Gear Rising: Revengeance