Custom Space Marine Chapter

[stygmatyr]

If you stick with the camo pattern armour, the army could look really good if you pull it off. As for a name, you could name it after a predator that uses camouflage, like a tiger or most lizards. Or something in mythology that avoids being seen. Or for some interesting background, handpicked from cadians deemed to be too good for standard guard duty, they become 'Stalkers of Cadia' or something along those lines.