I'm not pigeonholing Heinlein, thanks. There's a few recurring themes in some of his books; one is an enthusiastic embrace of militarism (and it's far from universal, it's mostly in his earlier books for younger readers). When something comes up, it's good to see it reproduced in a screen adaptation.

Militarism is intrinsically fascist. It's all about banding together, being stronger when pulling in a single direction, under the leadership of the state, and not brooking any dissent. It's intrinsically a dangerous social setup only suited to extremes of survival. I'm not a fan of fans of military qua military.