The mech gunner was used to defeat the Nazi zombies in the movie Sucker Punch. It was piloted by Amber (Jamie Chung).
Sucker Punch Mech Gunner Papercraft

I got to see the movie last week but got a bit disappointed. The fight scenes, effects and the girls were awesome. Too bad the story sucked. Looks like we were sucker-punched.l Oh well, here's Baby Doll, the main protagonist of the movie.
Sucker Punch Papercraft Baby Doll