Armor customization (Halo 3)/Spartan

From Halopedia, the Halo wiki

Spartan armor
Armor Helmet Chest Shoulders
HTMCC H3 MarkVI Menu Render.png
Mark VI
Unlocked by default Unlocked by default Unlocked by default
HTMCC H3 CQB Menu Render.png
CQB
Unlocked by default Unlocked by default Unlocked by default
HTMCC H3 EVA Menu Render.png
EVA
Complete the entire Halo 3 campaign on Normal difficulty or higher (Campaign Complete: Normal) Beat Tsavo Highway on Normal difficulty or higher (The Road) Beat The Ark on Normal difficulty or higher (Refuge)
HTMCC H3 EOD Menu Render.png
EOD
Complete the entire Halo 3 campaign on Legendary difficulty (Campaign Complete: Legendary) Beat Tsavo Highway on Legendary difficulty Beat The Ark on Legendary difficulty
HTMCC H3 Hayabusa Menu Render.png
HAYABUSA
Collect all 13 skulls Collect 5 skulls Collect 9 skulls
HTMCC H3 Scout Menu Render.png
Scout
Unlock the Used Car Salesman achievement Unlock the Too Close to the Sun achievement Unlock the Mongoose Mowdown achievement
HTMCC H3 Recon Menu Render.png
Recon
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Security
Get 1,000 gamerscore N/A Get 750 gamerscore
HTMCC H3 ODST Menu Render.png
ODST
Reach the rank of H3 Rank Private Icon.svg Private in multiplayer (Spartan Graduate) N/A
HTMCC H3 MarkV Menu Render.png
Mark V
Achieve the rank of H3 Rank Sergeant Icon.svg Sergeant in multiplayer (UNSC Spartan) N/A
HTMCC H3 Rogue Menu Render.png
Rogue
Reach the rank of H3 Rank Lt Icon.svg Lieutenant in multiplayer (Spartan Officer) N/A
HTMCC H3 Katana Menu Render.png
Katana
N/A Earn 49 achievements or earn 1,000 gamerscore N/A
HTMCC H3 Bungie Menu Render.png
Bungie Armor ("Flaming head")
N/A Be an employee of Bungie Studios N/A