Siannon-133

Chief Petty Officer Siannon-133 was a SPARTAN-II commando, one of the few genetically and intellectually superior children handpicked by the UNSC's Office of Naval Intelligence to become super-soldiers. Kidnapped and forced into military training at the age of six, she honed her skills as a precocious warrior until the age of fourteen, when she underwent dangerous experimental augmentation procedures to enhance her physiology. She died on the operating table after her body underwent severe reactions to the chemical changes forced onto it and could not be revived. Though her body was cryogenically preserved in hopes of future resuscitation, plans to resurrect her never saw fruition; in 2532, her brain was approved for use in Colonel 's Project MNEMOSYNE and subsequently destroyed in order to create a "smart" AI.