Ground Zeroes Incident

Operation Trojan Horse was an operation carried out by the XOF unit led by Skull Face under orders from Cipher to destroy Militaires Sans Frontieres and thier leader Big Boss due to MSF getting stronger and for Big Boss resisting Cipher.

History
In 1975 XOF had captured MSF child soldier Chico holding him at Camp Omega and forced him to reveal information about MSF and forcing him to play as the traitor. Skull Face used Chico as a distraction for Big Boss to be away from Mother Base and told him to give his regards to Big Boss. Skull Face also put a device in Paz stomach as a message for Big Boss.

Going to Mother Base under a UN inspection XOF attacked Mother Base with Big Boss and Kaz Miller trying to fend them off and giving MSF soldiers a chance to escape. The operation was a success as Mother Base along with MSF was no more though Big Boss and Kaz were able to escape.