In order to hide the twist of Spoiler:Snake being a decoy protagonist and Raiden being the true main character, director Hideo Kojima personally put together the game's trailers himself. The footage for the E3 2000 trailer was recorded from Spoiler:the Tanker segment at the start of the game, when Snake is the playable character, and in the E3 2001 trailer, Spoiler:several scenes that focus on Raiden in the actual game were edited to swap him out with Snake.
Contributed by game4brains