For the next Halo game I think it would be nice if the AI were updated. So I have a few ideas I would like to share with the community.
-AI formations and Other Interactions
What if there was a large crowd of Covenant made up of Jackals, Grunts, and Elites and the Highest Ranking Elite told all the AI to get into a formation. An example of a formation is a Phalanx where a large triangle of Shield Jackals form. And behind the triangle or inside of it were Elites who are shooting over the Shields.
I would also like to see Marines using the Environment more. Such as taking cover in ditches or on rocks instead of them just walking around everywhere. Another example is that a Scorpion tank could be rolling somewhere and marines could be trailing behind it for cover.
Two marines could maybe pick up a Machine Gun turret and carry it somewhere and place it down together. Marines could also go prone and maybe there would be some sort of medical interaction where a Medic would attempt to keep a fallen marine alive and sometimes it would work.
I came up with another idea recently. I think that enemy and ally AI should be able to switch weapons according to what kind of battle they are in. Elites could have a long range weapon but when you engage them in a short range fight they will pull out a weapon such as an energy sword. This Idea should not be given to all AI. enemies with heavy weapons should not be able to do this and cannon fodder enemies such as grunts should be only given one weapon.
These are just some of My Ideas to improve AI I would like to hear all of yours! Tell us what you would like to see, what improvements could be made, and how you think it could make a campaign more enjoyable. If I like your idea I will post it here for everyone to see. <mark>Please post your own ideas!</mark>
Please be respectful in the comments below 
Ideas I Liked And Enjoyed Reading
Methew:
> I want to see Jackals slowly push up on your position while Grunts follow behind and/or to the side providing fire support. I want to see Hunters acting like shock troopers, working in pairs and enraging when one dies. I want to see enemy units use tactics more, aim better, fire faster, when Elites/Knights are around and degrade when they are not. I want to see Crawlers swarming in packs like actual dogs.
ROUG3:
> What I would love to see is AI behaviour changing depending on the difficulty. enemies on advanced difficulties will set up patrol formations and stronger defensive strategies as well as use cover more effectively… things like that.
> As an example, MC could be tasked with ambushing a covenant patrol, on normal this is simple because the group would just be walking almost casually as a group but on legendary the elite leader will have set up jackal scouting packs and lookouts and a group formation that would make it difficult to ambush.
> A meta game could also evolve from Sniping elite commanders, as to disorganise a group to make it easier to take out.
> It would add replay value for higher difficulties because you would be having a different experience depending on which difficulty you are playing on and I would much prefer changes like this to weapon damage increases and health buffs.
> Elites switching between weapons would be awesome as well. It would be funny if you could get noob comboed.