From Halopedia, the Halo wiki
The Halo 3 PC trailer was released on July 14, 2020. It depicts Halo 3 campaign and multiplayer gameplay as the fourth title release for the Master Chief Collection on PC.
The Hunter and the Hunted • Terminal trailer • Cinematic trailer • Remaking the Legend teaser trailer • Remaking the Legend official trailer • Cinematic launch trailer • Launch trailer • Rhythm • Lucky Grunt • Xbox One X Enhanced Trailer • PC Announcement • X019 Halo Reach Launch Trailer • Halo 3: ODST Firefight Teaser • Season 5 Trailer • Season 6 Trailer • Season 7 Trailer • Season 8 Trailer
Announcement trailer • Discover Hope • Signal Detected. Tag Designation: Foe • Step Inside • Campaign Gameplay Premiere • Campaign Gameplay Trailer • E3 2021 showcase segment (A New Generation) • Multiplayer Overview • Multiplayer Season 1 Cinematic Intro • PC Overview • Campaign Overview • The Banished Rise • Forever We Fight • Carry On • Campaign Launch Trailer • Lux Voluspa • Season 2: Lone Wolves Intro Cinematic