Always there is the illusion of the easy path. Always there is the illusion, which gripped Donald Rumsfeld and now grips many Democrats, that you can fight a counterinsurgency war with a light footprint, with cruise missiles, with special forces operations and unmanned drones. Always there is the illusion, deep in the bones of the Pentagon’s Old Guard, that you can fight a force like the Taliban by keeping your troops mostly in bases, and then sending them out in well-armored convoys to kill bad guys.