I think there's a lot of stuff that's really hard to defend against once it's deployed, launched, or implanted. Think about small arms, artillery rounds, dumb b

I think there's a lot of stuff that's really hard to defend against once it's deployed, launched, or implanted. Think about small arms, artillery rounds, dumb bombs, land mines, or improvised roadside bombs. You have deception, concealment, cover, armor, reactive armor, jamming, and some close-in weapon systems but the best defense is probably more active attacks against earlier links in the kill chain. I think what we (US military, intelligence community, and law enforcement) learned during the "Global War on Terror" (specifically about improvised explosive devices) was to analyze the networks and target the planning, recruiting, training, financing, manufacturing, and distribution components.