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Subaru was rescued from from a burning airport by Nanoha four years prior. This inicident inspired Subaru to join the armed forces with aspirations of becoming a powerful mage. By chance she was transfered into Mobile Section Six's Stars squad commanded by the very same person who rescued her. On the field, she is equipped with the rollerblade-like intelligent device Mach Caliber and the armed device Revolver Knuckle.

Source from Wikipeida