'Stonetooth' Harker is a Gunnery Sergeant of the Catachan Jungle Fighters second regiment.
Official Canon Edit
Harker is a veteran Jungle Fighter known for his incredible strength, even among the already tough Catachan regiment. He is able to carry a Heavy Bolter, something that normally only Space Marines in power armor can do. He also fought Tyranids bare-handed when he dropped his weapon.