The Crusaders is a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records, except that they were created some time after the Second Founding.
The Crusaders Chapter wears a quartered pattern of red and white on their Power Armour. The white squad specialty symbol -- Tactical, Assault, Devastator or Veteran -- is indicated on the right shoulder plate. A white Gothic numeral on the inside edge of the shoulder plate, next to the squad specialty symbol, indicates squad number. The chapter badge is worn on the left shoulder plate, which is white. The colour of the Aquila or Imperialis on the chest indicates company number in accordance with the Codex -- i.e. White (1st Company), Yellow (2nd Company), Red (3rd Company), etc.
The Crusaders' Chapter badge closely resembles the holy icon utilised by the Adeptus Ministorum -- a quartered red, stylised letter "I" with a large, white human skull in the centre of it with a beaming, quartered red halo surrounding it. This is placed over a field of white.
- Adeptus Astartes: Successor Chapters (Limited Release Booklet), pg. 29
- Chapter Approved 2001 - Second Book of the Astronomican, pg. 117