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Rosa Brooks grew up going to anti-war demonstrations. But later, ended up working for the US Department of Defense. She is the author of the new book How Everything Became War, and War Became Everything. Everything changed, she says, on September 11, 2001. She was a law professor at the time. Picture: A US Air Force MQ-9 Reaper drone is prepared for a training mission in Nevada, Credit: Isaac Brekken/Getty Images