From Halopedia, the Halo wiki
|This article contains information about a non-canonical subject that, while official, is not part of the established Halo universe.|
The "Hummer" was an early version of the Warthog, designed and discarded by Bungie. It was used in an early 100 polygon build of Halo: Combat Evolved based on their previous game Myth. It was based on the real world Humvee/HMMWV.