Astartes Strike Cruisers (CS)

The term Strike Cruiser (CS) applies to an entire type of ships - it's not just a single class. Just as Destroyer is a type of ship and the Cobra Torpedo Destroyer is a class. In this day and age, Strike Cruisers are almost exclusively used by the Astartes. They are potent warships, about the size of a Light Cruiser of the Imperial Navy. Regardless of class, they feature a heavily armored spaceframe, with ample shielding and powerful engines. 

Armament is relatively light and optimized for ship-to-ship boarding actions and planetary assaults rather than fleet battles. Strike Cruisers almost always have teleportariums, boarding torpedoes, and drop pods. Most classes also have large hangar bays, with Thunderhawks being favored.

A strike cruiser can comfortably support a full company of Astartes, with all the vehicles and support craft they might need. It's possible to cram one or two additional companies aboard, but these will then be without vehicles and support craft of their own.

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Scutum-class: The Scutum is perhaps the most common class of Strike Cruiser. It has much in common with the Spatha, including the bombardment cannon and launch bays, but drops lances in favor of better battery armament. Shielding is superb for a vessel this size. 

Spatha-class: The Gladius-class Attack Frigate's big brother. Its forward quarter is dominated bombardment cannon and cavernous launch bays for its large complement of Thunderhawks. It packs two forward-firing lances for ship-to-ship combat, and light batteries port and starboard. 

Vanguard-class: The Vanguard-class is a relatively uncommon variant that has been optimized for fleet combat, which can be seen as odd for a ship type never intended for this purpose. It drops the bombardment cannon altogether to pack twin lances, good battery broadsides, and excellent point-defense system. It's even more nimble than other Strike Cruisers.

Onager-class: The Onager is a rare class of Strike Cruiser. Its forward quarter is dominated by a massive Nova Cannon, a weapon more commonly found Mars-class battlecruisers. Because of the size of this weapon, the Onager has no launch bays or lances, and only a light battery armament. Like all Strike Cruisers, it's quick and agile for its size, but its shielding is sub-par.