Although Halo 3's events follow those of Halo 2 by only two weeks, the upgrade to HD meant that Bungie had to take care to keep Master Chief's appearance consistent between the games.

Despite being over 20 years old now, Halo 2 is back in the spotlight, as a player recently discovered an unused model of the original MacWorld demo version of Master Chief. The player in question ...

News MacSoft: Halo for Mac goes Gold Master By Peter Cohen DEC 7, 2003 4:00 pm PST ...

The leak contains content that spans the original Halo all the way up to Halo: Reach and even some early Halo: Master Chief Collection content too.