Published 1953, stories followed the adventures of Corbett, Astro, and Roger Manning (originally; later, T.J. Thistle), cadets at the Space Academy as they train to become members of the Solar Guard. The action takes place at the Academy in classrooms and bunkrooms, aboard their training ship the rocket cruiser Polaris, and on alien worlds, both within the Solar System and in orbit around nearby stars. Excellent condition for its age