A classic concept of a man with a rocket pack strapped to his back and a fin on his helmet then augmented by a phenominal artist, Dave Stevens. Why doesn't the rocket burn his legs off, you ask? That's not really the point.
In the movie version, there's a scene where Howard Hughes shows our hapless hero via news footage-esque film what the Nazis would do with the rocketpack should they get their notrious, facist hands on it. There's an awesome animated bit that put the cherry on top of this underrated film. Check it out - it's a gas.