Philip Mudd , Mudd : Ideology-driven adversaries are hard to eliminate . Liepman , Andrew Liepman : Our confrontation with ISIS offers strategies on fighting al Qaeda . It has n't . They say we need an achievable definition of victory , such as confining ISIS gains . Liepman , Mudd : Fight against ISIS will take patience and careful intelligence work .
Philip Mudd , Mudd : Ideology-driven adversaries are hard to eliminate . Liepman , Andrew Liepman : Our confrontation with ISIS offers strategies on fighting al Qaeda . They say we need an achievable definition of victory , such as confining ISIS gains . Liepman , Mudd : Fight against ISIS will take patience and careful intelligence work .