Chaos Space Marine Squad
They are the first thing you think of when you hear the word, 'Chaos Space Marines'. These are your heretical versions of the Space Marine Tactical Squad, and are the most common force of the Spiky Bois that is not a squeaking 5-year-old or a LSD meat sponge.
Chaos Space Marines have all the strengths and skills of their loyalist kin, but are further augmented by the powers of Chaos and experience from ten thousand years of battle. So while they are as resource-stricken as a hobo on food stamps, these guys are old enough to learn a few tricks or two up their sleeves. Since the Horus Heresy these warriors have known that their entire experience is now a neverending clusterfuck that makes Game of Thrones look politically coherent. They are wholly committed to the path they now tread, and they can expect no quarter from their former battle-brothers.
There is little uniformity between squads as much of the organization and structure of the former Space Marine Legions have either nuked themselves into oblivion, couldn't be fucked to do anything, been productive for 10 Millennia, went their own merry way to jerk-off, too busy playing tower defense or is suffering from severe anonymity issues. In place of appointed sergeants, they follow the strongest and most merciless Chaos Champions.
Clad in run-down Chaos Power Armour, the armament of Chaos Space Marines differs little from their loyalist counterparts, consisting of Bolters, Plasma Gun, Meltaguns, Flamers, and Heavy Bolters or one-handed Bolt Pistols and Plasma Pistols. For close combat, they are equipped with Close Combat Weapons such as Chainswords, Power Fists, Power Swords, Power Axes, or other ritual weapons. Chaos Space Marine heavy weapon squads are known as Havocs.