For me, the biggest difference between the book and the movie was the scene where a recruit asks why the state needs a mobile infantry when they could just push a button and launch a nuke.
– In the movie, the drill instructor pins the recruit’s hand to the desk with a knife and says something like “you can’t push the button now.”
– In the book, Heinlein goes into a political discussion about the need and uses for limited warfare and police actions by the state. There is a line, iirc, about “you don’t spank a baby with a hand grenade.”
The movie continues in this vein, taking all the political points Heinlein tries to make and turning them into puerile trash.
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