See firsthand how war photography is used to sway public opinion. In the autumn of 2014, the Royal Air Force released blurry video of a missile blowing up a pick-up truck which may have had a weapon attached to its flatbed. This was a lethal form of gesture politics: to send a 9-million bomber from Cyprus to Iraq and back, burning 35,000 an hour in fuel, to launch a smart missile costing 100,000 to destroy a truck or, rather, to create a...