A Halo mod for Arma 3 released by Foehammer Studios has just been released under the name of The Eridanus Insurrection. Its description tells us that the mod focuses on the civil war between the UNSC (United Nations Space Command) and the Insurrectionists, who are various groups of rebel factions within the human colonies.
The mod is said to add a multitude of factions, wider variety of weaponry and vehicles and a custom-made terrain for users to play on when the final version is released. Currently, the mod is at its 0.1 alpha stage and can be downloaded from here.
Halo fans should know that the mod will not include Covenants or Master Chief himself. Still, the idea itself seems promising!
Thank you DSOGaming for providing us with this information