Afghan National Army soldiers assigned to the 215th Corps, disassemble an air conditioning unit as part of a series of classes on infrastructure maintenance aboard Forward Operating Base Tombstone, Helmand province, Afghanistan, Aug. 14, 2014. The course is designed to provide Afghans with formal instruction and practical application with the equipment they will inherit as coalition forces withdraw. (Official U.S. Marine Corps photo by Lance Cpl. Darien J. Bjorndal, Marine Expeditionary Brigade Afghanistan/ Released)