Yeah, I'm replaying MGS in Twin Snakes version and I forgot..Raven said Decoy Octopus impersonated Darpa Chief.
Is it as simple as because the original Darpa Chief was dead? But then why did Snake not understand? Raven was like "This is the end of my hint."
[spoiler]Deocoy Octopus impersonated the Chief to get Snake to believe Foxhound had both detonation codes, when in fact, Ocelot accidentally killed the real DARPA chief. So Snake had to get the PAL key from Baker, so he could stop the launch, when in reality, he was activating it.[spoiler]
Oh yeah now I remember, thanks!