Four years after the last U.S. troops exited, Afghanistan is not a closed book.

The American presence persists, not through boots on the ground, but, according to the Taliban, above the country in the hum of drones.

¡°Our airspace is still occupied,¡± Taliban Education Minister Habibullah Agha recently told journalists. ¡°At night, American drones patrol the skies and we do not have the ability to see them or force them to turn back.¡±