As the US plans its Afghan troop withdrawal, what was it all for?

A woman embracing her husband after his return from a deployment to Afghanistan in 2014. David Goldman/AP.More than 2,400 American service members were killed in Afghanistan and more than 20,000 were wounded.
What exactly am I supposed to tell these mothers that their sons died for? What was it all for? It remains unclear if the more than 2,400 US troop and personnel deaths, US$2 trillion and 20 years achieved anything truly lasting on the ground in Afghanistan.