“Why not require military service in order to vote?” That was the premise of Robert Heinlein’s “Starship Troopers.” To be a “Citizen” with the right to vote, one had to first serve in the military. Read the book, ignore the movie.
Read the book, saw the movie, married a niece. It was good pulp sci-fi for a 14 year old, but can you imagine LRH was furious because people considered RAH the better writer of the two.