America has done all it can in Afghanistan — more troops won’t 'win' us anything

America has done all it can in Afghanistan — more troops won’t 'win' us anything | TheHill: 

The persistence of such violence after 16 years of U.S. intervention raises serious questions about the need for and ability of the United States military to address what is at root an internal Afghan security problem increasingly disconnected from core American security interests.
I am no stranger to these un-winnable crusades. In early 2011, my own unit flew into Kandahar — part of the last few thousand troops authorized under the Obama “surge.”