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This June 10, 2017 photo released by the U.S. Marine Corpsshows an AH-64 Apache attack helicopter provides security from above while CH-47 Chinooks drop off supplies to U.S. Soldiers with Task Force Iron at Bost Airfield, Afghanistan. Sixteen years into its longest war, the United States is sending another 4,000 troops to Afghanistan in an attempt to turn around a conflict characterized by some of the worst violence since the Taliban were ousted in 2001. They are also facing the emergence of an Islamic State group affiliate and an emboldened Taliban, who by WashingtonâÄ™s own watchdogâÄ™s assessment now control nearly half of Afghanistan. (U.S. Marine Corps photo by Sgt. Justin T. Updegraff, Operation Resolute Support via AP)