Season 3: Recon
From Halopedia, the Halo wiki
Season 3: Recon is the third season implemented into Halo: The Master Chief Collection. The Season debuted on September 21, 2020,[Note 1] with the launch of Halo 3: ODST as part of the collection on Steam and Windows. Although launched alongside Halo 3: ODST, the cosmetic unlocks available focus on adding new skins for Halo 3's multiplayer alongside new nameplates and Firefight characters. This season was preceded by Season 2: Spark and followed by Season 4: Reclaimer with the launch of Halo 4 on for PC on November 16, 2020. The season's logo is a stylised representation of Veronica Dare's helmet.
Seasonal events and challenges
Season 3 saw a new wave of Seasonal Challenges added for completion, with three offering the unlock of four exclusive Firefight characters not available in the original Halo 3: ODST or the Season 3 unlock table - these being the Bug-Splattered Buck and Injured Romeo skins (helmeted and helmetless), respectively. A number of other season challenges are also available to earn Season Points and XP.
The seasonal unlocks for Season 3: Recon take the form of the skins for weapons and visors in the multiplayer of Halo 3, Firefight character unlocks for ODST and ODST-themed nameplates for use in the menus. For The Master Chief Collection, the unlocks have been divided into 5 tiers of ten unlocks each. To progress a tier, all ten unlocks within must be unlocked. The season features over 80 unlockables, a departure from the 100 tiers seen in Seasons 1 and 2 due to the much shorter development time between releases. Including Challenge unlocks, Season 3 introduces to The Master Chief Collection;
Each unlock slot can be unlocked for 1 - or 2 for Firefight characters - rewarded through the collection's updated rank scheme or the Challenges implemented in the prior Spark update. In total, 61 are needed to unlock all content in Season 3.
September patch notes (Version 1.1829.0.0)
Season 3 launched alongside a large patch for The Master Chief Collection, with bug fixes and quality of life changes. The patch notes can be seen in full below.
These improvements came from feedback reported by our community and were resolved during or after the flight period of ODST. Thank you for participating!
Halo 3: ODST
Below is a breakdown of the specific fixes that have come with today’s update:
Halo: Combat Evolved
Halo 2 & Halo 2 Anniversary Multiplayer
Halo 3: ODST
October 14 patch notes (Version 1.1871.0.0)
A second patch was released during Season 3.
In the Flighting build for Season 3, the unlock system was to have included an additional nameplate known as Sirens (shown below), depicting the Genet vehicles employed by the New Mombasa Police Department. The nameplate was removed for the final release due to ongoing real-world controversy relating to the police. In the flight, the nameplate was unlocked for 1 at Tier 39.
In the December 2020 update, the original Dino Tracker nameplate was removed and replaced with an updated design - part of a wider initiative across the nameplates and skins to remove Jurassic Park references from the game for reasons unknown. The original design is shown below; the nameplate was replaced with an updated Dino Tracker design with the same name and unlock requirement (shown in the above tables).