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Customization - Technical Preview September/October 2021
The customization items available in the second Tech Preview were largely identical to their initial appearance in the first Tech Preview. As such, only those items that were changed in some way will be included below.
Note that the Sources and other information associated with each item are subject to change and may be very different when the game launches on December 8.

As in the July Tech Preview, the Customization menu could be accessed from the Main Menu by switching to the Customization tab. From there, players could choose to access one of the following four options (links are only available on those categories with information in this article):
Armor Hall - Armor customization
Weapons Bench - Weapon customization
Vehicle Bay - Vehicle customization
Body & AI - Body Type, Prosthesis, and Personal AI customization
There was a fifth option that was made inaccessible in-game: Spartan ID. No Spartan ID options were available through the Halo Waypoint app or beta website this time around, but it is notable that this section was formerly referred to as Presentation.
Armor Hall
The Armor Hall is the designated location for all Armor customization. Although more details are provided below on each of the following Armor Core Sockets, this list will allow you to skip to a desired Socket to see all updates or additions to the customization options visible within this Technical Preview. If a Socket is not listed, it did not have any items that were updated between the two Tech Previews.

As in the previous Flight, players can access the Core options from the Core selection menu, which are common between all Armor, Weapon, and Vehicle Cores. Unlike the previous Tech Preview, there is no longer an option to Favorite Cores. Instead, the first option is an Equip toggle, can also be done outside the menu.
The second option is the ability to Hide UI, temporarily making the UI invisible so only your customizations are shown. Pressing any button will bring the UI back.
The third and final option can be used to restore all sockets within a Core to their defaults.
The ability to Randomize or Optimize the customizations equipped on a Core has been removed entirely.
Different Armor Cores feature different Sockets, but thanks to a help document posted in the Insider Support, we now know that the list of Sockets includes, but is not limited to:
Armor Kit
Coating
Helmet
Visor
Chest
Left Shoulder
Right Shoulder
Gloves
Wrist
Utility
Knee Pads
Emblem
Emblem Palette
Armor FX
Most of these were already known, but there is one new addition: Emblem Palette. This is likely a way to change the color of the player's Armor Emblem in some limited fashion.
Coating
The Coating socket for the Mark VII Armor Core allows a player to customize the armor's colors, materials, and patterns all in one indivisible package.
The below Armor Coatings are shown in alphabetical order, which means that the rarities will be intermixed. Only Armor Coatings that were updated from the July Tech Preview have been included, so this list is not exhaustive.

Name: Arctic Void
Quality: Epic
Manufacturer: UNSC
Released: Season 1
Lore: What's cooler than cool?
Source: Reach level 21 in the Season 1 Battle Pass: For our Tomorrow (Free). (Updated)

Name: Bleached Bone
Quality: Legendary
Manufacturer: UNSC
Released: Season 1
Lore: In the end, the keelbugs conquer all.
Source: Unobtainable
This item is unchanged from the previous Tech Preview, but it shows how items without a source display "Coming Soon" when inspected.

Name: Blue Rampage
Quality: Epic
Manufacturer: UNSC
Released: Season 1
Lore: Don't stop for anything.
Source: Reach level 20 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)

Name: Cadet Brick (formerly Recruit Red)
Quality: Common
Manufacturer: UNSC
Released: Season 1
Lore: Standard paint and materials. (Updated)
Source: Unlocked by default.

Name: Cadet Yellow (formerly Recruit Yellow)
Quality: Common
Manufacturer: UNSC
Released: Season 1
Lore: Standard paint and materials. (Updated)
Source: Unlocked by default.

Name: Cosmic Corruption
Quality: Epic
Manufacturer: UNSC
Released: Season 1
Lore: Custom paint and materials.
Source: Reach level 24 in the Season 1 Battle Pass: For our Tomorrow (Free). (Updated)

Name: Estate Gold
Quality: Legendary
Manufacturer: UNSC
Released: Season 1
Lore: Not standard issue.
Source: Reach level 30 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)

Name: Ghost Grey
Quality: Epic
Manufacturer: UNSC
Released: Season 1
Lore: Even the dead can tell tales, with the right equipment.
Source: Reach level 26 in the Season 1 Battle Pass: For our Tomorrow (Free). (Updated)

Name: Hexen Slate
Quality: Rare
Manufacturer: UNSC
Released: Season 1
Lore: Humanity is ignorant of the miracles and secrets beneath their feet.
Source: Complete all Weekly Challenges and then complete the Capstone Challenge during a week when this item is available. (Updated)

Name: Scorpion Punch
Quality: Epic
Manufacturer: UNSC
Released: Season 1
Lore: Custom paint and materials.
Source: Reach level 13 in the Season 1 Battle Pass: For our Tomorrow (Free). (Updated)
Helmet
The Helmet Socket for the Mark VII Armor Core allows players to customize their helmet and attachments, if available.
The below Helmets and Attachments are shown in alphabetical order, which means that the rarities will be intermixed. Only Helmets and Helmet Attachments that were updated from the July Tech Preview have been included, so this list is not exhaustive.

Name: TRAILBLAZER
Quality: Epic
Manufacturer: Imbrium Machine Complex
Released: Season 1
Lore: TRAILBLAZER builds on the many successes of MJOLNIR [R] to pioneer integration of the latest forward observation and reconnaissance VISR systems into a single Spartan-friendly package.
Source: Reach level 25 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)

Name: FCI-I/AIRWOLF
Helmet: TRAILBLAZER
Quality: Epic
Lore: The latest in counter-stealth sensor technology, though most of its capabilities require extensive offline analysis.
Source: Reach level 29 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)
Visor
The Visor Socket for the Mark VII Armor Core allows players to customize their visor color and texture.
The below Visors are shown in alphabetical order, which means that the rarities will be intermixed. Only Visors that were updated from the July Tech Preview have been included, so this list is not exhaustive.

Name: Dragoon
Quality: Epic
Manufacturer: Lethbridge Industrial
Released: Season 1
Lore: A favorite of skyborne lancers.
Source: Reach level 27 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)

Name: Goblin
Quality: Rare
Manufacturer: Lethbridge Industrial
Released: Season 1
Lore: Tricksters are wise to hide their eyes.
Source: Reach level 9 in the Season 1 Battle Pass: For our Tomorrow (Free). (Updated)

Name: Phalanx
Quality: Rare
Manufacturer: Lethbridge Industrial
Released: Season 1
Lore: With shield and spear, vigilant.
Source: Reach level 14 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)

Name: Vandal
Quality: Epic
Manufacturer: Lethbridge Industrial
Released: Season 1
Lore: An open space means open minds if you don't spot the snipers.
Source: Reach level 19 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)
Chest
The Chest Socket for the Mark VII Armor Core allows players to customize their Chest attachments or elect to wear none.
The below Chests are shown in alphabetical order, which means that the rarities will be intermixed. Only Chests that were updated from the July Tech Preview have been included, so this list is not exhaustive.

Name: UA/M550D Halfplate
Quality: Rare
Manufacturer: Beweglichrüstungsysteme
Released: Season 1
Lore: Up-armor set, specced for minimal impact on Spartan mobility.
Source: Reach level 30 in the Season 1 Battle Pass: For our Tomorrow (Free). (Updated)

Name: UA/M557 Jackplate
Quality: Rare
Manufacturer: Beweglichrüstungsysteme
Released: Season 1
Lore: Up-armor module for Spartans tasked with breaching and urban warfare.
Source: Reach level 13 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)

Name: UA/RELIKT Cuirass
Quality: Epic
Manufacturer: Vakara GMBH
Released: Season 1
Lore: Armor reinforcement set made to the specific requirements of Spartan containment teams.
Source: Reach level 8 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)

Name: UTIL/ENAV Beacon
Quality: Common
Manufacturer: Vakara GMBH
Released: Season 1
Lore: Emergency navigational transponders, compatible with all civil and military networks.
Source: Reach level 23 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)
Left Shoulder
The Left Shoulder Socket for the Mark VII Armor Core allows players to customize their Left Shoulder Pad or elect to wear none.
The below Left Shoulder Pads are shown in alphabetical order, which means that the rarities will be intermixed. Only Left Shoulder Pads that were updated from the July Tech Preview have been included, so this list is not exhaustive.

Name: UA/Alair
Quality: Common
Manufacturer: Chalybs Defense Solutions
Released: Season 1
Lore: Supplemental deltoid/shoulder armor.
Source: Reach level 18 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)
Right Shoulder
The Right Shoulder Socket for the Mark VII Armor Core allows players to customize their Right Shoulder Pad or elect to wear none.
The below Right Shoulder Pads are shown in alphabetical order, which means that the rarities will be intermixed. Only Right Shoulder Pads that were updated from the July Tech Preview have been included, so this list is not exhaustive.

Name: UA/Alair
Quality: Common
Manufacturer: Chalybs Defense Solutions
Released: Season 1
Lore: Supplemental deltoid/shoulder armor.
Source: Reach level 17 in the Season 1 Battle Pass: For our Tomorrow (Paid). (Updated)
Wrist
The Wrist Socket for the Mark VII Armor Core allows players to customize their Wrist attachment or elect to wear none.

Name: UA/Type II-A1 Buckler
Quality: Rare
Manufacturer: Materials Group
Released: Season 1