The darkest note in the story it's what no conventional sci-fi blockbuster would dare to include is the Mortensen character's despairing realization that he must be prepared at any moment to fire a bullet into his beloved son should they be captured, since the bandits who roam the land would rape and kill the boy if he didn't.

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So what we have is a situation in which the U.S. government, while keeping the raid a secret and hoping to be in and out of Pakistan without incident, was prepared for and half expected to draw fire from the Pakistani military.

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It's a way to be prepared for the worst, so we practice lockdowns, fire drills and evacuations.

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Firefighters must be prepared to modernise working practices in return for pay increases, according to the Bain review into the fire service.

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