The Human Terrain System (HTS) was catapulted into existence in 2006 by the US military's urgent need for knowledge of the human dimension of the battlespace in Iraq and Afghanistan. Its centrepiece was embedded groups of mixed military and civilian personnel, known as Human Terrain Teams (HTTs), whose mission was to conduct social science research and analysis and to advise military commanders about the local population. Bringing social science - and actual social scientists - to the wars in Iraq and Afghanistan was bold and challenging. Despite the controversy over HTS among scholars, there...