Why Am I Here
From Halopedia, the Halo wiki
The Why Am I Here can be found on Beaver Creek on Halo: Combat Evolved. Players must walk up to where the Sniper Rifle spawns. Then they must head for the end of the path. Once players have made it to the end of the path, they must jump past the dead end. On the right side, there should be a place that players can jump onto. Then, there are some rocks that players must push down. Where the big one used to be, there should be "Why Am I Here" and some initials. If the player sill can't see it, move back a bit. Try zooming in to see it. This may be referenced to in the first episode of Red Vs. Blue.