What is the purpose of visiting a friend's Mother Base? Also, is there any boss battle with co-op play like Peace Walker? There is no CO-OP play. Visiting your friend's Mother Base, you can refer to your FOB defence. Related articles Where, in the game, are the micro transaction sections? During a single play at FOB, if a revenge player came to infiltrate my FOB, am I notified about it? Will Metal Gear Solid V: The Phantom Pain be released for next generation consoles? English (GB) Deutsch Español (España) Français Italiano