well.....unlike the end-of-times apocalyptic zombie infestation it is much....much more difficult to spot a terrorist...let alone get in the way of their nefarious plans.....
as others have mentioned - the best way is to avoid being attacked....low population areas/shelters/etc.....
and therein lies the rub......how on earth can one avoid something they don't see coming?
we need someone to develop a special type of sunglasses that will allow us to view the inner workings of terrorists....kinda like on the flick *They Live*......although that is silly.....
or, we work on educating and building the economies of the countries whose populations tend to hate americans.....political, socio and charitable.....that is not *surviving* an attack...that is preventing an attack....or we might find ourselves huddled underground rationing tic-tacs and relying on the early warning perimeter defenses of Guinea Pigs.....just my .02