As you stand at the checkpoint, you must constantly consider the various ways in which you may be attacked: Where are they going to come from? What will their strategy be? Is that child as innocent as he seems, or is he smuggling a weapon? Is that ambulance really rushing a woman to the hospital to give birth, or are there enemies hiding inside? Is that old man harmless, or is he deliberately diverting your attention from something that is happening behind your back? You have to get into their minds. They are creative, and they have already exploited our naivety and good will in the past. They can come up with anything, and you have to come up with it first.
These are the instructions soldiers receive before beginning their principle combat mission in the IDF: enforcement of military rule in the West Bank.