Equip our drones with spray tanks and dust Afghanistan with persistent nerve agent and defoliant/soil sterilant for the next five years. Turn it into Carthage.
Karzai and his corrupt band of looters had better have their “bug out bags” and escape aircraft on strip alert when the Americans and other allies leave Afghanistan. Karzai and company's looters will be standing against walls in front of Taliban firing squads. (If the Taliban don't get Karzai and company's looters, there are other Afghan strongmen itching for the chance to grant these guys a Long Dirt Nap.)