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Lots of people, even those should\xa0know better, often misconstrue the fundamental purpose of the U.S.\xa0military. Federal Drive Host Tom Temin's guest has written a provocative essay on the subject of\xa0deterrence, at a time when not much in the world seems deterred.\xa0Melanie W. Sisson is a fellow in the Foreign Policy program\u2019s Strobe Talbott Center for Security, Strategy, and Technology.\nLearn more about your ad choices. Visit podcastchoices.com/adchoices