Neither did Verhoeven, he apparently only read a couple chapters and had an assistant summarize the rest (https://www.looper.com/358395/the-real-reason-the-star

Neither did Verhoeven, he apparently only read a couple chapters and had an assistant summarize the rest (https://www.looper.com/358395/the-real-reason-the-starship-troopers-director-never-read-the-book/ https://www.looper.com/358395/the-real-reason-the-starship-t...). So I wouldn't assume that the movie strictly adheres to the events laid out in the book.