Marcus

Marcus is a variant of the UNSC Marine face bitmap found in Halo: Combat Evolved, modeled after the game's art director Marcus Lehto. It is used for Sergeant Stacker's appearance. One can find it by opening a Halo: Combat Evolved map in Halo Map Tools. Not including Avery Johnson, there are six variants of face bitmaps. They are in DDS DXT1 texture format.

Trivia

 * In Halo 4, Sergeant Stacker's full name is revealed to be "Marcus P. Stacker", ostensibly a reference to the texture file and its namesake, while "P." is likely a nod to Stacker's voice actor, Pete Stacker.
 * To make the model for the unidentified Bumblebee pilot, Bungie artist Chris Hughes took Marcus and edited it to become female.