Changes

The equipping of the legions was only partially complete when the [[Horus Heresy]] broke out. Many of the newly equipped chapters turned against the Imperium while many loyal chapters had old style armour. With war damage and mobile operations resupply for damaged equipment was difficult or impossible. Marine artificers and [[Techmarine]]s had to use old style equipment from older models to keep chapters fighting. The Mark 5 is commonly called the Heresy Suit. This pattern is distinguished by a studded helmet, shoulder plate and greaves. These studs are the tops of bolts which attach each layer of the armour to one another. The helmet appears to be an early version of the Mk. VII helmet, although it is significantly more low-tech in its design.