My girlfriends step dad abuses her what could/should I do?

Anonymous
My girlfriend currently lives at home and her step dad calls her n** (yes she is black he's white) spits his chew spit on her car she's almost positive he's stole money from her and the list goes on. She's too scared to go to her mom because last time it got worse. Now before y'all say she's a bad mother she has cancer and is too tired to deal with it from chemo and shit. He won't do it around her mother nor me but when they are at home alone together he torments her. Im leaving for the army in a few months so I can't move her in with me and she's a senior in high school. I have had no problem physically confronting people when I was in highschool but now that I'm graduated running people up walls has its repecutions. (< I don't know how to spell that word sorry) what would you guys do? Personally I think he needs a big ass kicking but sadly doing so would kick me out of the army.
My girlfriends step dad abuses her what could/should I do?
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