Belligerent Engine
The Dreadnoughts of the Angry Marines are known better within the chapter as the Belligerent Engines. Why are they called Belligerent Engines? First consider the sheer amount of seething rage and fury that is typically exhibited in any Angry Marine. Now, knock out his kneecaps and maybe some internal organs for good measure, and observe as his levels of anger escalate considerably. Continue this process until he's on the very verge of death, with his state of mind resembling that of an exploding volcano. Now finally fuse him into the cold, metallic shell of a Dreadnought, thus rendering him more machine than man, and thereby erasing whatever little precious joy he once experienced from life. Now, behold!-- having been binded to a weaponized, armored sarcophagus, and with his mental condition having reached the point of 'Wrath of God,' the end-result is a mechanized war-machine that could only possibly be denoted as being a Belligerent Engine.