Harcourt does an excellent job of tracing the history of counterinsurgency warfare from French tactics in Algeria through Vietnam, and ultimately via the War on Terror into the relationship of the US government to its citizens. He discusses aspects of this new governing tactic which are broad ranging indeed: from police surveillance of mosques after 9/11 to Pokemon Go.
Of particular interest to me was his analysis of the doctrine of "exceptionalism," which posits that the deviations from normal are justified to the public as temporary deviations from the rule of law that will end and we will return to "normal" legalities as soon as the extraordinary "danger" (here, terrorism) has ended. He pushed back against this theory, arguing (convincingly, in my view) that what is actually happening is the legalization of the extraordinary. That is, we are not in a temporary state where the rule of law is suspended, but in a permanent state where what is acceptable under the law has changed. His prime example are the Bush (and later Obama) legal opinions justifying torture, remote drone assassinations of US citizens--but also including the whithering of due process and failure of the courts to grapple with excessive use of force). For example, the court created doctrine of qualified immunity holds that no officer can be held liable for use of force, because no officer had previously been held liable for use of force).
My concern with Harcourt's argument is that his emphasis on counterinsurgency means that he deemphasizes the role of racism in legitimating both the surveillance state and the prison industrial complex. Whether applied in Afghanistan or the West Side of Chicago, it simply isn't true that we are trying to identify a small group of insurgents. Rather, we are simply labelling entire neighborhoods (or countries) as enemy territory, which we need to occupy and neutralize, and where residents are treated as enemy combatants, rather than citizens in need of protection. These neighborhoods and countries are inevitably those occupied by Black and Brown people.
Despite this disagreement with Harcourt's emphasis, this is a very interesting book, advancing a comprehensive viewpoint which neatly explains both US policy abroad and US policy towards its own citizens, all based on counterinsurgency theory.