Version 7.3:
Improved Chief and Spartan armor/visors
Improved BR material
Improved Pelican cockpit materials
Improved Phantom explosions
Increased Railgun explosion range
Increased reserve ammo for certain weapons
Fixed Shade Turret materials and enhanced explosion
Adjusted when certain chapter title cards appear
Disabled forced blob shadows on certain BSPs throughout the levels (may result in nicer looking shadows idk)
Fixed bugs with certain level triggers not working
Added area lights on IFF tags
Adjusted timing on dialogue in the first cutscene with Lasky & Palmer
Attempts to fix potential bugs in Reclaimer with MAC cannon not firing (tried to make it fire regardless of whether it has line of sight)
Reduced time for Target Designator to reload

Version 7.2:
Increased bloom in all scenes
Adjusted contrast in all scenes
Fixed certain effects not rendering
Improved various explosion effects throughout the campaign
Fixed some UNSC weapon crates not showing lights (think I got them all)
Improved skin materials on Elites, Grunts and Jackals
Improved Zealot armor material
Improved materials on Battle Rifle, Storm Rifle, and Needler
Added longer trails and better visual cues for live grenades
Completely overhauled Promethean Vision visuals
Attempted to improve active camo further (adding the "stealthy" trait to active players)
Greatly reduced area damage when destroying Covenant power cores (like on Reclaimer)
Fixed broken red reticle when zooming with the Magnum
Fixed Elite blood coming out of disintegrated Crawlers
Fixed and rebalanced Knights and Crawlers using Suppressors
Added damage bonus for heavy weapon melee and Needler melee
Increased and fixed reserve ammo amount for all weapons
Increased starting ammo count on Forerunner and Midnight
Modded scripts to help prevent auto-cleanup/despawning of dead AI, weapons and broken scrap (doesn't always work, especially in Spartan Ops)
Fixed Spartan Ops missions on Lockup not loading

First Steam release, version 7.1.1