You probably haven't wondered what Halo 5: Guardian's trailer looks like in Grand Theft Auto 5, via the game's Rockstar Editor, but YouTuber Adam Pinkman has answered that very qustion.
Pinkman uses the Plane Crash 1.0 mod from Game68240, which can be downloaded from GTA Mods, for the video.
Halo 5, which went gold yesterday, launches October 27th and sees the UNSC go after Master Chief, who they believe has turned against him. The UNSC declares Chief dead, even as they dispatch Spartan Locke to hunt him down with Fireteam Osiris. Chief isn't alone however, he was Blue Team backing him up.
Why they undergo this cover-up and think Chief has turned traitor are surely questions which will be answered when the game launches later this month.