Board Thread:Metal Gear Solid V/@comment-4913740-20140331092208/@comment-67.202.183.138-20141018002601

Actually, yeah, it was, further down:

"In Peace Walker, the MSF logo is also a skull. Snake and his allies fought under this symbol of a skull, and during his battle against Skull Face he forms Outer Heaven, which also uses the skull as a symbol. There is a sad story behind all of this, a subplot."

I wish I could edit posts. :P