Halo 5: Guardians Warzone Firefight Trailer
From Halopedia, the Halo wiki
The Halo 5: Guardians Warzone Firefight Trailer was a video created by 343 Industries to support the new Warzone Firefight mode for Halo 5: Guardians. It was released alongside the game mode on June 29, 2016. There is no dialog in the video other than text on the screen.