Yours is to serve, unto the last drop of your blood, that your brothers might live to fight on. Watch over them, heal them, offer up your very life should it extend theirs but a moment, and by your sacrifice the enemy be slain. And when the time comes that you must fulfill your most solemn oath, speak clearly, speak proudly, speed the bolt that brings his end and send him joyous to the Emperor's side. Then do your duty, take that which is due, and know your mission is done.
EXTRACT FROM THE APOCRYPHA OF EONS, VERSE V, CHAPTER L (M40 REDACTION)

After she was critically injured by a IED on Rhodes Island during a insurgent attack, almost her whole upper torso was replaced or fortified with biotech implants. With Cobra ceramite armour, she is able to charge head on into heavy arms fire to save those that need deliverance from the enemy, and deliver the end to the pain of those too critically injured to be moved from the battle. Memories of the most brutal and bloody scenes of destruction haunt her, slowly driving her to insanity…
AG1- Engage the Rest for the Damned(spiky bit on her left arm-delete the spike)