Former intelligence officials describe a nation better equipped to disrupt terrorist plots, but still wrestling with the costs of its response and how to prevent the next crisis under escalating technology threats.

Twenty-five years after 9/11, governments still risk strategic surprise when they fail to imagine how familiar threats combine in new, disruptive ways.

Former intelligence officials describe a nation better equipped to disrupt terrorist plots, but still wrestling with the costs of its response and how to prevent the next crisis…