This is one of Heinlein’s so called juveniles stories. It’s about young boys training to become officers in the Interplanetary Patrol. No girls are allowed there. It’s a kind of adventure that boys in the end of the 40′s might have liked. The science is silly as well. Even when this was written, it wouldn’t have seemed likely to find intelligent beings on Mars and Venus and in the asteroid belt. I had hoped that this book was a Starship Troopers light version, but it wasn’t.
Eventhough I didn’t enjoy reading this, there was some good parts in the book. The meeting with the primitives on Venus was interesting. When it turned out that the primitives actually were the advanced venusians I thought about when I read something similar… Oh yes, is was the 2300AD adventure called “Ranger”.