When reading the article on Lexicanum about Company heraldy, it says that squads have different colour trims on their shoulder pads. I know most of the Ultramarines have it this way, and there are pictures of how the Salamanders do this (their chapter marking in different colours). But does every chapter do this?
The Crimson Fists for example? Do they have any 'company markings'? Or the Red Scorpions?