That’s actually what the book is about, though! Heinlein was a classic example of a libertarian-turned-fascist. He wrote a book about how war is cool and the military is a necessary part of an ordered society. The book reads like satire because you would have to be a very dumb Nazi to read it and think “Of course we should be constantly at war with a faceless and dehumanized enemy, and create a society around that principle. This makes sense and is good.” but that’s literally what Heinlein was trying to say, or at least present as a possibility in the book.

There’s some argument that he was being ironic and leaving things to be interpreted by the audience, but if you look at his work on the whole, and his political opinions, it’s clear that he’s just a bog-standard American conservative who likes war, racism, and misogyny, but doesn’t like the government or taxes.