Scintillan Fusiliers
18th Century French in SPAAAAAAAAAAACCCCCCCCEEEEEEE!!!!!!
Which is why they are eager for war yet most of them suck at fighting and have little tactical or strategic sense. So, really old French attire combined with World War II suckiness and Napoleonic ego.
Basically, a regiment made up of blue bloods who think they are better than all the other rabble and aim to prove it. Dressed like they have come out of a painting from the 18th century complete with powdered wigs, tricorner hats, and bright colored pantaloons. Introduced in Only War, as a regiment made up from the capital planet of the Calixis sector of Dark Heresy fame. Famous for not caring much for other regiments, especially Catachans leading to more than a few unfortunate accidents in which the Scintillans "accidentally" called in artillery or the like too close to their supposed comrades. Please note however they have made sure to keep friendly fire rate well under the acceptable averages for combined regiments. When anyone's looking, at least. If you want to complain about them, and why would you since that is heresy, they have lots of friends in high places. Of course, a habit of "friendly fire" at regiments who tend to be sent against the most horrific enemies in the galaxy and daemon invasions is generally a bad idea. Because they'll rip your balls off and replace your eyes with them. Then you'll really have "eyeballs"!
Currently, they are awaiting redeployment against the Dark Eldar. Hilarity will ensue
Quotes
"I can assure you that almost all units of the Scintillan 17th have been withdrawn from the target zones and we will be ready to commence orbital strikes on the Ork vanguard shortly. I also realize that significant elements of the Catachan 223rd have not reached the safe zone. This was always an anticipated risk, and I think I speak for many here when I say: really, who will miss them?"
- Commander-General Pailus, Scintillan 4th Army Group (What a Dick!)