Board Thread:Metal Gear Solid V/@comment-24677150-20140313040957/@comment-24745807-20140407221529

SF and Big Boss going way back doesn't necessarily mean that they were friends. After thinking about all of this, I think that SF is a new character in that we haven't seen him before in any form, but he is still connected to BB and Zero in some way. I think SF's hatred for Zero came first from something Zero did during his time in the SAS and his hatred for BB came from SF being involved in the losing side of the Peacewalker Incident. Just a theory.