In one of the first districts the team entered, Tracy identified an unusually high concentration of widows in one village, Colonel Woods said. Their lack of income created financial pressure on their sons to provide for their families, she determined, a burden that could drive the young men to join well-paid insurgents. Citing Tracy’s advice, American officers developed a job training programme for the widows.

In another district, the anthropologist interpreted the beheading of a local tribal elder as more than a random act of intimidation: the Taliban’s goal, she said, was to divide and weaken the Zadran, one of southeastern Afghanistan’s most powerful tribes. If Afghan and American officials could unite the Zadran, she said, the tribe could block the Taliban from operating in the area. “Call it what you want, it works,” said Colonel Woods. “It works in helping you define the problems, not just the symptoms.” The process that led to the creation of the teams began in late 2003, when American officers in Iraq complained that they had little to no information about the local population. Pentagon officials contacted Montgomery McFate, a Yale-educated cultural anthropologist working for the Navy who advocated using social science to improve military operations and strategy.