With no backup from Perseus waiting in the wings, the confrontation at Duga ends a lot differently. Adler questions Bell about the wild goose chase at Duga, Bell reveals his true allegiance, and then Adler puts him down. That's it! Basically, Perseus still wins and detonates the nukes, but team Adler lives to fight another day. You still get basically the same wrap-up, but with Perseus' voice breaking down the player's actions throughout the campaign.