Colonel 'Iron Hand' Straken

Colonel 'Iron Hand' Straken is the commander of the Catachan Jungle Fighters second regiment.

Official Canon
Straken received his "Iron Hand" after losing his arm and a significant portion of his chest when it was bitten off by a Mirial Landshark. Straken beat the shark into submission and completed his mission before seeking medical attention. His propensity for running into the thick of combat and shouting at his men to fight harder inspires them to defeat the enemy even against severe odds.

TTS Canon
Straken sent a distress call when he and the Catachan Jungle Fighters were being hunted by the Masque of Slaanesh for their massive muscles. Corvus Corax, Vulkan, and their respective chapters came to their aid, but the primarchs demanded that the regiment join their crusade to protect Terra as repayment. Straken obliged, regrouping on catachan to summon the remaining Jungle Fighters. They were nearly killed, however, when a Catachan Barking Toad appeared; when they were rescued by Sly Marbo, Straken hoped that the legendary Jungle Fighter would be joining them in the Crusade.