(FILES) In this file photo US Marines from the 2nd Battalion, 8th Marine Regiment of the 2nd Marine Expeditionary Brigade wait for helicopter transport as part of Operation Khanjar at Camp Dwyer in Helmand Province in Afghanistan on July 2, 2009.   President Joe Biden's decision to withdraw foreign troops from Afghanistan ushers in a new set of risks for the United States and its military. Officially, the Pentagon supports the US president's decision to end America's longest war. But many senior US commanders have been voicing their misgivings for months. 
 / AFP / MANPREET ROMANA
US withdrawal from Afghanistan risks leaving a vacuum that terrorist groups could exploit. AFP

Afghanistan after US withdrawal: political settlement or total collapse?