Heinlein’s great — still love Starship Troopers! Too bad Hollyweird messed that up as well, worse than Jackson messed up The Hobbit. (He also monkeyed too much with the LotR, but not as bad as The Hobbit.)
I consider the movie of Starship Troopers a completely separate entity.
It’s so far off, it really isn’t it.
Later, we both learned that it has been used in Military Classes for many years.