From Halopedia, the Halo wiki
The Halo 3 PC trailer was released in July 14, 2020. It depicts Halo 3 campaign and multiplayer gameplay as the fourth title release for the Master Chief Collection on PC.
ONI Archive: Noble Endeavors • Conflict Evolved • Changing Tides • Allied Forces • Helljumpers • Reclaiming Our Place
Menu Backgrounds: Echoes of Heroes • Unseal the Hushed Casket • Machine & Nerve • Finish The Fight • Prepare to Drop • Wake Up, John