 Why did it happen after a 20-year campaign there, the expenditure of thousands of lives, the expenditure of trillions of dollars? How is it that this came to be back in the control of the Taliban? The other question I was asked was just what was it like? What was the human element of this? What was it like dealing with desperate people trying to flee their country with their lives in a carrier bag? What was it like for the people on the ground? And what was it like for the soldiers who'd invested so much for so little over that 20 years?