Uh no. I have recently written an article about this very subject. Heinlein seems militaristic in the "starship troopers" but he effectively kills two of the concepts militarists love: the chosen one myth - that the soldiers, best ones at least, are chosen ones and they should be smart and brilliant and be a Nietzschean superman, and discipline myth - that because the soldiers are disciplined, they are better than civilians. You can read it in the chapters where Rico is inducted into Officer Training School, where Major Reed is giving the Moral Philosophy lesson again.

Actually, if you take a look at the man's literary career I think he is just experimenting with the "what is best ruling regime?" "Starship troopers" is a possible answer, so is the "moon is a harsh mistress" and I even see the "Stranger in a Strange Land" in this light.

My two cents.