"The coalition maintains nearly 13,000 troops from 39 countries as part of a mission to train, advise and assist Afghan troops."

Two points. First, that means that up to 13,000 families are wondering what their men/women are doing in Afghanistan.

Second. It is hard to believe that troops from a country which has been involved in almost continuous war need training. 

And our troops are involved in such activity in Syria and or Iraq. 

Tump would certainly gain a lot of points if, as suspected, he pulls troops out.