In 1999, in a book titled “Unrestricted Warfare,” Qiao Liang and Wang Jiangsui, two colonels in China’s People’s Liberation Army, predicted that violent conflict would soon transcend all limits: “The battlefields will be everywhere” and the boundaries between “the worlds of war and not war, of military and non-military, will be destroyed.” In “How Everything Became War and the Military Became Everything,” Brooks provides a masterful analysis of how global connectedness has created vast new responsibilities (and vulnerabilities) for the armed forces of the United States, including cybersecurity, intelligence gathering, the interdiction of drugs, guarding and prosecuting “detainees,” conducting drone strikes against suspected terrorists, apprehending pirates, training judges, building Ebola isolation wards, distributing relief to people suffering from famine, natural disasters and civil war. A senior fellow at the New America Foundation, a professor of law at Georgetown University and a consultant for Human Rights Watch, Brooks also worked as a senior adviser at the U.S.