From Lexicanum

Extra Armour is used by the Imperial Guard, Space Marines, Daemonhunters, Witch Hunters and Chaos Space Marine forces. Sometimes it is elaborately detailed armour and sometimes simple sheets of ceramite. They do however, prevent the vehicle from being shaken around so much on weaker impacts.

Sources

• Warhammer 40,000: Wargear
• Codex: Imperial Guard (3rd Edition, 1st Codex)
• Codex: Imperial Guard (3rd Edition, 2nd Codex)
• Codex: Space Marines (4th Edition)
• Codex: Daemonhunters (3rd Edition)
• Codex: Witch Hunters (3rd Edition)
• Codex: Chaos Space Marines (3rd Edition, 2nd Codex)

Related Articles

• Imperial Guard Vehicle Upgrades
• Space Marine Armoury
• Witch Hunters Armoury
• Daemonhunters Armoury
• Chaos Space Marine Armoury