My bottom line has been and probably will remain “Starship Troopers”. read it in the early 1960’s as “space rangers against the galaxy” and thoroughly enjoyed it. Read it less than a decade later as a political science text and wondered “Why not?” Went back to the same book 30 years later as a conceptual framework for USAF manning in 2030.
Same book.
Very interesting.
BTW the ultimate RAH book is “The Notebooks of Lazarus Long” - one of his quotes appeared on my retirement shadow box; “You can have peace or freedom. Don't ever expect both.”