From War Is Boring:
“The current fight against Al Qaeda appears to have no end,” Leonard Weinberg and Arie Perliger wrote in the latest Sentinel counter-terrorism journal. (Not yet online.) “Various tactics have been employed to defeat the terrorist group, including assassinating cell leaders and “re-educating” members. Yet the network persists … “
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My Comment: Kudos to War is Boring in reproducing this chart .... it appears that killing or capturing the enemy produces results.