From publisher blurb: Strap on your rocket-pack, grab your guns, and take to the sky to help defeat the vile Nazi horde! Set a few years ahead in the Hollow Earth Expedition timeline, this supplement presents a fictional military unit that lets your heroes blast around the skies in the fashion of The Rocketeer. Contains details on and stats for the elite US Rocket Rangers, their SS counterparts, and two new weird science weapons, plus adventure seeds and full rules for using rocket-packs in your Ubiquity games.