The US Marine Corps has returned to Helmand, the restive province in southern Afghanistan where it fought years of bloody battles with the Taliban, to help train Afghan forces struggling to contain the insurgency.
Many of the 300 Marines coming to Helmand as part of the NATO-led Resolute Support training mission are veterans of previous tours in the province, where almost 1,000 coalition troops, mostly US and British, were killed fighting the Taliban.
(U.S. Marine Corps photo by Sgt. Dustin D. March)
When they left in 2014, handing over the sprawling desert base they knew as Camp Leatherneck to the Afghan army, the Marines never expected to return. The fact that they are back underlines the problems Afghan forces have faced since being left to fight alone.