The United States is doing more than just building facilities for the Afghan National Army and Afghan National Police. We are buying weapons, tools, vehicles, uniforms, food, water. . . If it is required to run an army, we are outfitting the Afghans with it. Even fire trucks.
At one installation, the U.S. delivered a nice, shiny new fire truck for the base fire department. Apparently, the limited number of fires freed up the truck for more urgent requirements: Pumping and hauling sewage from septic tanks. Might as well let your house burn down.