The Iron Champions primarily wear black coloured Power Armour. The shoulder plates are slate grey in colour. The Iron Champions also paint a fearsome looking skull on their helmets to strike the fear of the Emperor into their foes. The black coloured squad specialty symbol (Tactical, Assault, Devastator, or Veteran), is indicated on the right shoulder guard. A white coloured Roman numeral on the centre of the squad specialty symbol indicates squad number. The Aquila or Imperialis on the chest guard indicates company number in accordance to the Codex Astartes -- i.e. White (1st Company), Yellow (2nd Company), Red (3rd Company), Green (4th Company) etc.