BTS: Anniversary Campaign
From Halopedia, the Halo wiki
BTS: Anniversary Campaign is a 343 Industries Behind-the-Scenes documentary video that offers a look at the developmental process of the remastered campaign experience featured within Halo: Combat Evolved Anniversary, and was first released on YouTube and Halo Waypoint on October 17, 2011. It features exclusive interviews with both 343 Industries and Saber Interactive employees.
The video closes as it displays the game's title, the game's release date and the 343 Industries logo.