Halo Infinite's co-op campaign will enter public testing in July
Owning Halo Infinite is like having a subscription to a magazine where each issue has part of a model stuck to the front. The first issue brought the game's multiplayer modes, the second issue brought its singleplayer campaign, the third issue finally fixed its Big Team Battle mode, and the fourth issue - by which time you've possibly lost interest - will bring online co-op for its campaign.
If you're one of those still reading this metaphorical magazine, you can get beta access to the co-op mode this July if you sign up to Halo Insider.