Halo 5's 4-Player Co-Op Allows for a Much More Sociable Story - GameSpot

Microsoft explains why it's focusing so heavily on four-player co-op with the upcoming game.
A new entry in the Halo franchise was announced at the Microsoft Press Conference at E3 2013 for the Xbox One.

Actually, Halo 5's Campaign Co-Op Does Require Xbox Live Gold - GameSpot

Halo Infinite Dev Explains Why They Canceled Local Co-Op Despite 80% of It Playable Through Exploit : r/XboxSeriesX

Halo Infinite Co-Op Campaign Is Now Playable With A Glitch, But Beware - GameSpot

Halo 5: Guardians – Xbox One : Microsoft Corporation

Halo 5: Guardians' review: A solid, blockbuster experience - The Washington Post

Halo: Reach - Wikipedia

343 Admits They Screwed Up With Halo 5's Story

Halo Infinite Campaign Network Co-Op Flight Preview : r/Games

Why was Halo 5 so different from the other Halo games, and then so badly received? - Quora