' serves as a direct sequel to ' and follows Naked Snake's life after disbanding from FOX. With Snake not yet accepting the Big Boss codename, the plot features the origins of his mercenary unit as he attempts to escape the San Hieronymo Peninsula and battles his old unit. The canonicity of "Portable Ops" is disputed, with Kojima having stated, "...the main story of Portable Ops is part of the Saga, is part of the official Metal Gear timeline, while some of the small details that are in Portable Ops are outside the Saga, not part of the main timeline of the game."